Re: gum preservatves
Hi Guido. Probably both 1g per 100g gum or 2.5g per 100g gum are correct values since it works for us. I thought if 0.1% is good for food then it can be also good for gum arabic solution. I just want to do it to see what will happen... Thanks for the tip! I also want to try casein ASAP and I can surely use a faster coating solution (with paper negatives). You increased my motivation for casein! Will ask you about acrylics later... (Have to go out now.) Regards, Loris. 4 Eylül 2008, Perşembe, 5:06 pm tarihinde, Guido Ceuppens yazmış: > Hi Loris, > I am not sure what the "correct" amount of sod benzoate per weight of > (dry) > gum is. I just asked the importer advice on preserving the gum mixture. I > also read somewhere about "sour" gum being faster (Kuhn?) but never tried > it. If I need a faster reacting mix (as when using RC photo paper as > negative) I use casein instead of gum: a speed gain of approx 2 stops for > me. I also use PVA (Mowiol), a mixture of mowiol with paint and pot > bichromate can, even after 2 weeks storage, be used for printing without > loss of speed or quality. Mowiol however prints slower than gum - approx. > 2 > stops slower in my set-up. I mainly use both casein and mowiol when > printing > with Acrylic paints. > > Greetings, > Guido
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