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(organic chemistry) The synthetic dye indigotin used to replace natural indigo.
Beginning at his dusty oxfords and indigo blue jeans, her scrutiny continued up to a neatly tucked in worn white cotton shirt with the sleeves rolled up to mid arm.
It is an indigo-blue powder, soluble in hydrochloric acid, but insoluble in dilute nitric and sulphuric acids.
This body occurs also in the blood of Crustacea and of Molluscs, but its abundance in both Limulus and Scorpio is very marked, and gives to the freshly-shed blood a strong indigo-blue tint.
It is an amorphous or crystalline mass of indigo-blue or steel-grey colour, which is insoluble in water and is also infusible.
When unaltered and containing no ferric oxide, the mineral is colourless, but on exposure to the light it very soon becomes of a characteristic indigo-blue colour.
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