# this file is part of refractiveindex.info database
# refractiveindex.info database is in the public domain
# copyright and related rights waived via CC0 1.0

REFERENCES: |
    M. R. Querry. Optical constants, <a href="https://apps.dtic.mil/sti/citations/ADA158623"><i>Contractor Report</i> CRDC-CR-85034 (1985)</a>
COMMENTS: |
    70% Cu, 30% Zn.
DATA:
  - type: tabulated nk
    data: |
        0.2100 1.140 1.314
        0.2200 1.179 1.381
        0.2300 1.227 1.442
        0.2400 1.271 1.482
        0.2500 1.301 1.512
        0.2600 1.315 1.544
        0.2700 1.323 1.586
        0.2800 1.336 1.637
        0.2900 1.358 1.688
        0.3000 1.388 1.731
        0.3100 1.419 1.764
        0.3200 1.446 1.789
        0.3300 1.473 1.807
        0.3400 1.494 1.815
        0.3500 1.504 1.815
        0.3600 1.503 1.815
        0.3700 1.497 1.818
        0.3800 1.487 1.818
        0.3900 1.471 1.813
        0.4000 1.445 1.805
        0.4100 1.405 1.794
        0.4200 1.350 1.786
        0.4300 1.278 1.784
        0.4400 1.191 1.797
        0.4500 1.094 1.829
        0.4600 0.994 1.883
        0.4700 0.900 1.957
        0.4800 0.816 2.046
        0.4900 0.745 2.145
        0.5000 0.686 2.250
        0.5100 0.639 2.358
        0.5200 0.602 2.464
        0.5300 0.573 2.568
        0.5400 0.549 2.668
        0.5500 0.527 2.765
        0.5600 0.505 2.860
        0.5700 0.484 2.958
        0.5800 0.468 3.059
        0.5900 0.460 3.159
        0.6000 0.450 3.253
        0.6100 0.452 3.345
        0.6200 0.449 3.434
        0.6300 0.445 3.522
        0.6400 0.444 3.609
        0.6500 0.444 3.695
        0.6600 0.445 3.778
        0.6700 0.444 3.860
        0.6800 0.444 3.943
        0.6900 0.445 4.025
        0.7000 0.446 4.106
        0.7100 0.448 4.186
        0.7200 0.450 4.266
        0.7300 0.452 4.346
        0.7400 0.455 4.424
        0.7500 0.457 4.501
        0.7600 0.458 4.579
        0.7700 0.460 4.657
        0.7800 0.464 4.737
        0.7900 0.469 4.814
        0.8000 0.473 4.890
        0.8100 0.478 4.965
        0.8200 0.481 5.039
        0.8300 0.483 5.115
        0.8400 0.486 5.192
        0.8500 0.490 5.269
        0.8600 0.494 5.346
        0.8700 0.500 5.423
        0.8800 0.507 5.500
        0.8900 0.515 5.575
        0.9000 0.523 5.650
        0.9100 0.531 5.724
        0.9200 0.538 5.797
        0.9300 0.546 5.870
        0.9400 0.555 5.944
        0.9500 0.563 6.016
        0.9600 0.572 6.087
        0.9700 0.580 6.158
        0.9800 0.588 6.228
        0.9900 0.596 6.298
        1.0000 0.603 6.367
        1.0100 0.610 6.437
        1.0200 0.616 6.507
        1.0300 0.622 6.578
        1.0400 0.628 6.649
        1.0500 0.635 6.720
        1.0600 0.642 6.792
        1.0700 0.650 6.862
        1.0800 0.658 6.933
        1.0900 0.667 7.004
        1.1000 0.675 7.074
        1.1100 0.684 7.144
        1.1200 0.693 7.214
        1.1300 0.702 7.283
        1.1400 0.711 7.351
        1.1500 0.718 7.419
        1.1600 0.726 7.487
        1.1700 0.733 7.557
        1.1800 0.743 7.627
        1.1900 0.752 7.694
        1.2000 0.761 7.760
        1.2100 0.766 7.826
        1.2200 0.770 7.895
        1.2300 0.775 7.967
        1.2400 0.783 8.040
        1.2500 0.793 8.112
        1.2600 0.803 8.182
        1.2700 0.813 8.251
        1.2800 0.823 8.320
        1.2900 0.834 8.390
        1.3000 0.844 8.459
        1.3100 0.856 8.528
        1.3200 0.867 8.595
        1.3300 0.878 8.662
        1.3400 0.888 8.728
        1.3500 0.898 8.795
        1.3600 0.908 8.861
        1.3700 0.917 8.928
        1.3800 0.926 8.994
        1.3900 0.934 9.061
        1.4000 0.942 9.128
        1.4100 0.950 9.196
        1.4200 0.958 9.265
        1.4300 0.968 9.335
        1.4400 0.978 9.405
        1.4500 0.989 9.474
        1.4600 1.001 9.542
        1.4700 1.013 9.609
        1.4800 1.024 9.675
        1.4900 1.034 9.742
        1.5000 1.044 9.810
        1.5100 1.055 9.878
        1.5200 1.067 9.946
        1.5300 1.079 10.014
        1.5400 1.091 10.080
        1.5500 1.102 10.146
        1.5600 1.113 10.213
        1.5700 1.124 10.280
        1.5800 1.135 10.347
        1.5900 1.146 10.415
        1.6000 1.158 10.483
        1.6100 1.171 10.552
        1.6200 1.184 10.619
        1.6300 1.199 10.686
        1.6400 1.214 10.751
        1.6500 1.228 10.814
        1.6600 1.240 10.879
        1.6700 1.252 10.943
        1.6800 1.264 11.008
        1.6900 1.276 11.073
        1.7000 1.288 11.138
        1.7100 1.302 11.203
        1.7200 1.315 11.266
        1.7300 1.326 11.328
        1.7400 1.335 11.390
        1.7500 1.342 11.456
        1.7600 1.350 11.523
        1.7700 1.360 11.593
        1.7800 1.372 11.662
        1.7900 1.386 11.730
        1.8000 1.398 11.796
        1.8100 1.410 11.863
        1.8300 1.437 12.000
        1.8400 1.452 12.068
        1.8500 1.468 12.135
        1.8600 1.484 12.202
        1.8700 1.500 12.267
        1.8800 1.517 12.332
        1.8900 1.532 12.396
        1.9000 1.547 12.459
        1.9100 1.562 12.524
        1.9200 1.576 12.588
        1.9300 1.591 12.654
        1.9400 1.604 12.718
        1.9500 1.618 12.786
        1.9600 1.633 12.855
        1.9700 1.654 12.922
        1.9800 1.676 12.986
        1.9900 1.696 13.044
        2.0000 1.711 13.101
        2.0100 1.723 13.161
        2.0200 1.733 13.226
        2.0300 1.748 13.295
        2.0400 1.767 13.363
        2.0500 1.789 13.426
        2.0600 1.809 13.485
        2.0700 1.826 13.545
        2.0800 1.842 13.607
        2.0900 1.861 13.666
        2.1000 1.878 13.725
        2.1100 1.894 13.784
        2.1200 1.910 13.842
        2.1300 1.924 13.902
        2.1400 1.938 13.961
        2.1500 1.950 14.023
        2.1600 1.967 14.084
        2.1700 1.983 14.146
        2.1800 1.999 14.206
        2.1900 2.014 14.265
        2.2000 2.028 14.324
        2.2100 2.042 14.385
        2.2200 2.057 14.447
        2.2300 2.073 14.511
        2.2400 2.093 14.570
        2.2500 2.110 14.628
        2.2600 2.127 14.686
        2.2700 2.144 14.743
        2.2800 2.159 14.797
        2.2900 2.171 14.853
        2.3000 2.182 14.909
        2.3100 2.193 14.966
        2.3200 2.201 15.026
        2.3300 2.211 15.087
        2.3400 2.220 15.151
        2.3500 2.232 15.217
        2.3600 2.248 15.283
        2.3700 2.266 15.350
        2.3800 2.287 15.411
        2.3900 2.306 15.466
        2.4000 2.324 15.522
        2.4100 2.337 15.578
        2.4200 2.349 15.636
        2.4300 2.363 15.697
        2.4400 2.377 15.755
        2.4500 2.391 15.813
        2.4600 2.403 15.872
        2.4700 2.415 15.932
        2.4800 2.427 15.995
        2.4900 2.443 16.055
        2.5000 2.456 16.114
        2.5063 2.467 16.153
        2.5126 2.476 16.192
        2.5189 2.487 16.230
        2.5253 2.497 16.268
        2.5316 2.507 16.306
        2.5381 2.517 16.343
        2.5445 2.527 16.381
        2.5510 2.537 16.419
        2.5575 2.546 16.457
        2.5641 2.556 16.495
        2.5707 2.565 16.533
        2.5773 2.574 16.571
        2.5840 2.582 16.610
        2.5907 2.591 16.649
        2.5974 2.600 16.689
        2.6042 2.609 16.729
        2.6110 2.618 16.770
        2.6178 2.627 16.810
        2.6247 2.636 16.851
        2.6316 2.645 16.892
        2.6385 2.654 16.934
        2.6455 2.663 16.975
        2.6525 2.672 17.017
        2.6596 2.681 17.059
        2.6667 2.690 17.103
        2.6738 2.699 17.146
        2.6810 2.709 17.190
        2.6882 2.718 17.234
        2.6954 2.728 17.278
        2.7027 2.738 17.323
        2.7100 2.748 17.368
        2.7174 2.758 17.413
        2.7248 2.769 17.458
        2.7322 2.780 17.504
        2.7397 2.790 17.551
        2.7473 2.802 17.597
        2.7548 2.813 17.644
        2.7624 2.826 17.691
        2.7701 2.837 17.737
        2.7778 2.849 17.784
        2.7855 2.861 17.832
        2.7933 2.874 17.879
        2.8011 2.886 17.927
        2.8090 2.898 17.974
        2.8169 2.911 18.023
        2.8249 2.924 18.072
        2.8329 2.937 18.120
        2.8409 2.950 18.169
        2.8490 2.963 18.218
        2.8571 2.977 18.268
        2.8653 2.990 18.318
        2.8736 3.004 18.368
        2.8818 3.018 18.418
        2.8902 3.033 18.468
        2.8986 3.047 18.518
        2.9070 3.062 18.568
        2.9155 3.077 18.619
        2.9240 3.091 18.669
        2.9326 3.105 18.720
        2.9412 3.119 18.772
        2.9499 3.134 18.824
        2.9586 3.149 18.877
        2.9674 3.165 18.929
        2.9762 3.180 18.981
        2.9851 3.196 19.034
        2.9940 3.211 19.087
        3.0030 3.227 19.140
        3.0120 3.242 19.193
        3.0211 3.258 19.248
        3.0303 3.274 19.302
        3.0395 3.291 19.356
        3.0488 3.307 19.410
        3.0581 3.323 19.466
        3.0675 3.339 19.521
        3.0769 3.356 19.517
        3.0864 3.373 19.633
        3.0960 3.390 19.690
        3.1056 3.408 19.746
        3.1153 3.426 19.803
        3.1250 3.444 19.860
        3.1348 3.462 19.917
        3.1447 3.480 19.974
        3.1546 3.498 20.032
        3.1646 3.516 20.090
        3.1746 3.535 20.148
        3.1847 3.553 20.207
        3.1949 3.571 20.266
        3.2051 3.591 20.326
        3.2154 3.610 20.386
        3.2258 3.630 20.445
        3.2362 3.650 20.505
        3.2468 3.670 20.565
        3.2573 3.690 20.625
        3.2680 3.710 20.685
        3.2787 3.730 20.746
        3.2895 3.750 20.808
        3.3003 3.770 20.870
        3.3113 3.791 20.931
        3.3223 3.812 20.993
        3.3333 3.832 21.055
        3.3445 3.852 21.118
        3.3557 3.873 21.181
        3.3670 3.893 21.244
        3.3784 3.915 21.308
        3.3898 3.935 21.372
        3.4014 3.957 21.436
        3.4130 3.978 21.501
        3.4247 3.999 21.566
        3.4364 4.020 21.631
        3.4483 4.041 21.698
        3.4602 4.062 21.765
        3.4722 4.083 21.832
        3.4843 4.105 21.900
        3.4965 4.127 21.968
        3.5088 4.149 22.037
        3.5211 4.171 22.106
        3.5336 4.194 22.176
        3.5461 4.216 22.246
        3.5587 4.238 22.317
        3.5714 4.261 22.390
        3.5842 4.285 22.462
        3.5971 4.310 22.534
        3.6101 4.335 22.606
        3.6232 4.359 22.679
        3.6364 4.383 22.753
        3.6496 4.409 22.828
        3.6630 4.434 22.902
        3.6765 4.461 22.977
        3.6900 4.487 23.051
        3.7037 4.513 23.126
        3.7175 4.538 23.202
        3.7313 4.564 23.279
        3.7453 4.571 23.356
        3.7594 4.618 23.433
        3.7736 4.646 23.511
        3.7879 4.672 23.589
        3.8023 4.700 23.668
        3.8168 4.728 23.748
        3.8314 4.756 23.827
        3.8462 4.785 23.907
        3.8610 4.813 23.988
        3.8760 4.841 24.069
        3.8911 4.870 24.151
        3.9063 4.898 24.233
        3.9216 4.928 24.316
        3.9370 4.957 24.400
        3.9526 4.987 24.484
        3.9683 5.017 24.568
        3.9841 5.047 24.653
        4.0000 5.077 24.739
        4.0161 5.107 24.825
        4.0323 5.137 24.913
        4.0486 5.169 25.001
        4.0650 5.200 25.089
        4.0816 5.230 25.178
        4.0984 5.260 25.269
        4.1152 5.292 25.361
        4.1322 5.325 25.454
        4.1494 5.359 25.547
        4.1667 5.392 25.640
        4.1841 5.425 25.735
        4.2017 5.459 25.831
        4.2194 5.494 25.928
        4.2373 5.531 26.026
        4.2553 5.568 26.124
        4.2735 5.607 26.223
        4.2918 5.646 26.322
        4.3103 5.687 26.420
        4.3290 5.726 26.518
        4.3478 5.766 26.616
        4.3668 5.806 26.716
        4.3860 5.847 26.815
        4.4053 5.887 26.916
        4.4248 5.928 27.017
        4.4444 5.969 27.120
        4.4643 6.012 27.222
        4.4843 6.053 27.325
        4.5045 6.097 27.428
        4.5249 6.139 27.533
        4.5455 6.183 27.637
        4.5662 6.226 27.742
        4.5872 6.271 27.848
        4.6083 6.315 27.954
        4.6296 6.359 28.060
        4.6512 6.402 28.168
        4.6729 6.446 28.276
        4.6948 6.491 28.385
        4.7170 6.534 28.496
        4.7393 6.579 28.608
        4.7619 6.624 28.721
        4.7847 6.671 28.834
        4.8077 6.717 28.948
        4.8309 6.762 29.064
        4.8544 6.808 29.181
        4.8780 6.857 29.299
        4.9020 6.906 29.417
        4.9261 6.954 29.535
        4.9505 7.002 29.654
        4.9751 7.049 29.775
        5.0000 7.097 29.898
        5.0251 7.146 30.022
        5.0505 7.195 30.148
        5.0761 7.245 30.274
        5.1020 7.296 30.402
        5.1282 7.348 30.532
        5.1546 7.400 30.662
        5.1813 7.453 30.793
        5.2083 7.506 30.926
        5.2356 7.560 31.060
        5.2632 7.615 31.195
        5.2910 7.671 31.331
        5.3191 7.727 31.468
        5.3476 7.784 31.606
        5.3763 7.841 31.745
        5.4054 7.899 31.885
        5.4348 7.958 32.026
        5.4645 8.015 32.168
        5.4945 8.072 32.313
        5.5249 8.129 32.461
        5.5556 8.190 32.612
        5.5866 8.252 32.763
        5.6180 8.317 32.914
        5.6497 8.381 33.065
        5.6818 8.445 33.217
        5.7143 8.507 33.371
        5.7471 8.569 33.528
        5.7803 8.633 33.688
        5.8140 8.698 33.850
        5.8480 8.765 34.015
        5.8824 8.834 34.181
        5.9172 8.903 34.347
        5.9524 8.973 34.514
        5.9880 9.041 34.685
        6.0241 9.111 34.859
        6.0606 9.183 35.037
        6.0976 9.258 35.216
        6.1350 9.334 35.397
        6.1728 9.411 35.581
        6.2112 9.492 35.766
        6.2500 9.573 35.952
        6.2893 9.656 36.140
        6.3291 9.738 36.332
        6.3694 9.825 36.528
        6.4103 9.916 36.724
        6.4516 10.009 36.921
        6.4935 10.103 37.120
        6.5359 10.199 37.321
        6.5789 10.300 37.524
        6.6225 10.403 37.729
        6.6667 10.511 37.931
        6.7114 10.620 38.133
        6.7568 10.728 38.334
        6.8027 10.836 38.538
        6.8493 10.946 38.744
        6.8966 11.060 38.951
        6.9444 11.174 39.159
        6.9930 11.291 39.365
        7.0423 11.407 39.573
        7.0922 11.527 39.780
        7.1429 11.644 39.989
        7.1942 11.762 40.197
        7.2464 11.880 40.409
        7.2993 11.998 40.621
        7.3529 12.118 40.834
        7.4074 12.235 41.047
        7.4627 12.352 41.264
        7.5188 12.468 41.484
        7.5758 12.586 41.707
        7.6336 12.705 41.930
        7.6923 12.821 42.154
        7.7519 12.936 42.380
        7.8125 13.047 42.611
        7.8740 13.158 42.847
        7.9365 13.266 43.088
        8.0000 13.375 43.337
        8.0645 13.484 43.592
        8.1301 13.597 43.852
        8.1967 13.712 44.116
        8.2645 13.825 44.383
        8.3333 13.938 44.657
        8.4034 14.049 44.939
        8.4746 14.164 45.229
        8.5470 14.280 45.527
        8.6207 14.403 45.830
        8.6957 14.526 46.140
        8.7719 14.652 46.456
        8.8496 14.912 46.780
        8.9286 15.051 47.114
        9.0090 15.051 47.453
        9.0909 15.194 47.798
        9.1743 15.343 48.147
        9.2593 15.493 48.504
        9.3458 15.649 48.865
        9.4340 15.806 49.236
        9.5238 15.971 49.611
        9.6154 16.137 49.997
        9.7087 16.312 50.389
        9.8039 16.493 50.790
        9.9010 16.684 51.193
        10.0000 16.878 51.601
        10.1010 17.076 52.013
        10.2041 17.276 52.438
        10.3093 17.486 52.870
        10.4167 17.706 53.306
        10.5263 17.932 53.746
        10.6383 18.162 54.190
        10.7527 18.397 54.640
        10.8696 18.636 55.097
        10.9890 18.880 55.560
        11.1111 19.130 56.031
        11.2360 19.385 56.509
        11.3636 19.646 56.993
        11.4943 19.912 57.485
        11.6279 20.182 57.982
        11.7647 20.453 58.489
        11.9048 20.726 59.009
        12.0482 21.006 59.547
        12.1951 21.301 60.094
        12.3457 21.606 60.647
        12.5000 21.916 61.204
        12.6582 22.227 61.773
        12.8205 22.542 62.357
        12.9870 22.867 62.955
        13.1579 23.200 63.563
        13.3333 23.537 64.187
        13.5135 23.884 64.825
        13.6986 24.238 65.482
        13.8889 24.608 66.149
        14.0845 24.982 66.833
        14.2857 25.367 67.531
        14.4920 25.759 68.251
        14.7059 26.165 68.989
        14.9254 26.585 69.745
        15.1515 27.018 70.518
        15.3846 27.464 71.308
        15.6250 27.922 72.113
        15.8730 28.385 72.939
        16.1290 28.857 73.791
        16.3934 29.342 74.674
        16.6667 29.848 75.584
        16.9492 30.372 76.519
        17.2414 30.915 77.478
        17.5439 31.475 78.457
        17.8571 32.043 79.466
        18.1818 32.622 80.507
        18.5185 33.212 81.598
        18.8679 33.830 82.726
        19.2308 34.469 83.900
        19.6078 35.134 85.110
        20.0000 35.815 86.381
        20.4082 36.537 87.705
        20.8333 37.298 89.081
        21.2766 38.101 90.491
        21.7391 38.921 91.950
        22.2222 39.760 93.481
        22.7273 40.630 95.102
        23.2558 41.557 96.820
        23.8095 42.559 98.608
        24.3902 43.616 100.470
        25.0000 44.720 102.423
        25.6410 45.879 104.502
        26.3158 47.131 106.723
        27.0270 48.511 109.066
        27.7778 50.022 111.531
        28.5714 51.675 114.093
        29.4118 53.449 116.784
        30.3030 55.370 119.629
        31.2500 57.475 122.654
        32.2581 59.821 125.831
        33.3333 62.410 129.145
        34.4828 65.251 132.621
        35.7143 68.393 136.282
        37.0370 71.895 140.107
        38.4615 75.795 144.087
        40.0000 80.139 148.216
        41.6667 84.991 152.486
        43.4783 90.419 156.828
        45.4545 96.436 161.229
        47.6190 103.106 165.710
        50.0000 110.527 170.240
        52.6316 118.974 175.042
        55.5556 128.885 179.300