RE: Gum Preservatives
Well, I dumped it... Gum is cheap here (ask KeithG & DavidH) :)) Making a new batch doesn't take much time too. Just stirring 15-20 mins patiently (it's very much like making dough) + waiting overnight... (I do ~300ml batches by dissolving 100g gum in 200g water) Despite some quirks, it was a nice event in general. Of couse, having 4 alt. process exhibitions and 2 alt. process workshops was amazing / wonderful. I'm very grateful the artists... Best regards, Loris. BTW, I use formaldehyde to preserve classic cyanotype sensitizer part A and to harden gelatine sizing. It's absolutely perfect for both purposes... -----Original Message----- From: sam wang [mailto:stwang@bellsouth.net] Sent: 06 Aralık 2006 Çarşamba 16:21 To: alt-photo-process-l@usask.ca Subject: Re: Gum Preservatives Hi Loris, There are many preservatives that can be used. Judy suggested formaldehyde. Thymol works well enough for me except when I put in too little - I wanted to put in a minimum amount. The smelly gum printed fine, maybe even better than fresh. I hope you didn't throw out your spoiled gum. Anyone interested in making Smellotypes? Odorgrams? By the way, Sandy showed me the schedule of events for the Istanbul photofest. Very impressive! Sam On Dec 6, 2006, at 1:27 AM, Loris Medici wrote: > Yes, I'm sure that this works perfectly (IIRC, Christina Anderson and > David Hatton - and probably many other gum printers around - also use > pure Thymol to preserve gum). Probably other impurities in thyme water > caused my gum go bad. I probably would use Thymol if I could locate it > easily but, in my case Sodium Benzoate was obtainable more easily > and it > was cheaper than pure Thymol crystals. > > Regards, > Loris.
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