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The definition that was given here before for acid dyes was wrong. It read "Acid dye is a dye that at first burns but then slowly seeps into the substance applied to change the colour." This is completely untrue. As a quick counter-example, food colorings are acid dyes, yet they are completely harmless, and certainly do not burn at all. — Preceding unsigned comment added by 22.214.171.124 (talk • contribs) 15:31, 22 August 2005
The definition right now is not that great still. I'm thinking of a better one. At the very least there's nothing solid provided to distinguish acid dyes from direct dyes. If I understand things correctly, the key lies in textile, fibres, polymers dyeing application. Legate of Skai (talk) 10:03, 11 January 2011 (UTC)