Det holder sig ganske fint ved stue temperatur i en standart zip-bag og så halv mørkt 
Fandt også lige dette, bare lige for at komme med en anden kilde, godt nok et det om ketamin i opløsning, men syntes stadig lige det havde relevans.
Color of solution may vary from colorless to very slightly yellowish and may darken upon prolonged exposure to light. This darkening does not affect potency. Do not use if a precipitate appears. Protect from light.
Store at controlled room temperature, 15° to 30° C( 59° to 86° F)."
This also hints at why some powder Ketamine some people encoutner is somewhat yellowish, as well as the liquid itself. Forunately enough this means Ketamine is a pretty stable molecule.