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Webster 1913 Edition

Sulphindigotic

Sulph-inˊdi-got′ic

,

Adj.

(Chem.)

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

.