A) It contains fatty alcohols; you should apply a heavy amount to condition the hair.

B) It contains drying alcohols (like Isopropyl); you must use it sparingly to avoid severely dehydrating the natural lashes and causing brittleness.

C) It contains zero alcohol and is mostly made of essential oils; no adjustments are needed.

D) It means the primer has turned into an aggressive perm solution and should be thrown away immediately.