If the van urk reagent is used to test a sample and it turns bluish-purple, what drug does this indicate the presence of?

 A van urk reagent is considered to be specific and also sensitive of which it is in chromogenic reagents. If it is used in as a test sample, turning the sample in bluish-purple in color, the drug that indicated its own presence is LSD or also known as Lysergic Acid Diethylamide. It is a type of psychedelic drug.

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c.  and at that point will start to turn into steam (gas)