after this there comes a bright band which attains its maximum of intensty in the blue and lastly the violet end of the spectrum again suffers absorption. Now if a small quantity of a solution of sulphate of cop line disappears immediately and after a short time the second bright band begins to approach the red end of the spectrum and finally extends in this direc tion to the extent of about one-eighth of the breadth of the entire spectrum. The indigo solution how., scientific american, 1865-08-05
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