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.

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.