Sulphindigotic

Sulph·in`di·got'ic adjective (Chemistry) Of, pertaining to, or designating, a sulphonic acid obtained, as a blue solution, by dissolving indigo in sulphuric acid; -- formerly called also cerulic sulphuric acid, but properly called indigo-disulphonic acid .
Found on http://www.encyclo.co.uk/webster/S/236

Sulphindigotic

• (a.) Of, pertaining to, or designating, a sulphonic acid obtained, as a blue solution, by dissolving indigo in sulphuric acid; -- formerly called also cerulic sulphuric acid, but properly called indigo-disulphonic acid.
Found on http://thinkexist.com/dictionary/meaning/sulphindigotic/
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