preserver for gum

hello to all.
I am preparing an arabic gum solution for my impressions, 200 ml. of water
and 70 gr. gum powdered.
Can I use as preservative "FENOL" or "CARBOLIC ACID?"
if it is this way, in what proportion?.

thank you.

Pardon for my English, text translated by computer.
Received on Thu Feb 26 14:43:01 2004