[alt-photo] Re: preserving gum arabic solution

[Alberto Novo]

> I mixed up some gum arabic solution (from silverprint) 70g to 200ml distilled water and stored it in a clean brown glass bottle. To this I added 5 drops of 10% formalin I bought from ebay. It's been a few weeks and my gum smells sour and has started to grow mould. Do you have any advice on how to prevent this? Stronger fomalin/formaldehyde or more drops? Cheers

I have used a few chrystals of Sodium Azide; my gum arabic solution is still 
there in the refrigerator since 2001 and looks like just made. 

Alberto
www.grupponamias.com
www.alternativephotography.com/articles/art102.html