[alt-photo] Re: preserving gum arabic solution

[Ian Hooper]

Thymol has been working for me.

1 gram thymol dissolved in 5 ml alcohol.

A few drops of that solution has kept a litre of gum fresh for 6 months so
far (at room temp).

-Ian

-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
Gareth Jarvis
Sent: June 17, 2010 3:16 PM
To: alt-photo-process-list at lists.altphotolist.org
Subject: [alt-photo] preserving gum arabic solution


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

This is what I used...
http://cgi.ebay.co.uk/Buffered-Formalin-10-Preserving-Specimens-500ml-/13031
0573208?cmd=ViewItem&pt=UK_BOI_Medical_Lab_Equipment_Lab_Supplies_ET&hash=it
em1e571d8c98
 		 	   		  
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