Looking for a source for photographic gelatin of different melting points and hardness for a gum bichromate experiment. Thanks, Bill
Looking for a source for photographic gelatin of different melting points and hardness for a gum bichromate experiment. Thanks, Bill
The only source of photographic gelatin I know is 250 Bloom from Photographers' Formulary. "Photographic gelatin" is so-called because it's been purified for silver gelatin emulsion making. That's not necessary for gum prints. Culinary gelatin sources are your best bet for a range of bloom numbers. Platinum leaf is also 250 (but compare the price with the Formulary's gelatin), Knox gelatin is 225, gold leaf=200, and silver leaf=160. Gelatin sold for making molded prosthetics is 300 bloom. That stuff sets up like rubber! Lab supply houses have a number of odd gelatins. I have a 85 bloom beef gelatin that I haven't gotten around to using yet, but I imagine it sets up very soft. Good luck with your experiments. Sounds interesting.
There's a supplier in the UK in Pontypridd, Glamorgan, Wales, who I think supplies Ilford & Fuji etc, P B Gelatins.
They do sell gelatin in the US as well.
Ian
dwross -- interesting you mention culinary gelatin. I've had that question since many recipes call for "sheet gelatin, x number of sheets" and I just saw one that specified 'gold leaf'. I was going to research that today. Which do you reccomend for a panna cotta?
Sadly, since middle-age spread started getting the best of me, I only cook stir-fries and silver gelatin emulsions. (It's not nice of you to mention panna cotta before I've had my breakfast!)
Ian, thanks for that link to PB. I wasn't aware of them. Looks like a very good resource.
If you are in the US and if you don't need photo-grade and are looking for more than a box of Knox Unflavored Gelatin, BulkFoods has good prices and shipping is reasonable. They used to have a link to specs that listed it as 250 bloom but I didn't see that when I just looked. I know Vaughn Hutchins was using this for Carbon Transfer prints.
Dan
Dan Williams
Enumclaw WA
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