Hi Puzzlewoman,
Looking back at previous threads relating to this puzzle, it appears that if you don't pick up at least 15 of the 16 powders when you first enter the store room then a glitch occurs and the game prevents you from collecting these powders later on. Very frustrating!
I have a saved game with the washbowl for Kordax complete, just let me know if you would like me to e-mail it across to you.
