User:Enix150/ReagentTables/Sulfuric acid

With sulfuric acid, a range of colours is obtained with compounds of various types. Steroids give ORANGE or YELLOW colours, many of which ﬂuoresce under ultraviolet light (350 nm) either immediately or after dilution (see below). Thioxanthenes give RED or ORANGE colours which ﬂuoresce under ultraviolet light (350 nm).

Recipes:
 * Apply concentrated sulfuric acid (98%) directly to the sample on a white tile or in a test-tube.

Diluted method: Add gradually 10 mL of conc. sulfuric acid to 90 mL of ethanol. Spray plate and heat gently on a hot plate to develop.