Re: ferri sesquichlorati
Thanks, I think I´ll stay with "multiple" layers and avoid exact numbers in a description I am writing. Understood that the 20 layer claim was for thinner solutions, Have not done more than 5 myself.. Will post an "alternative" gum method soon, different than this particular method. Just need to tidy up things a bit... On 10/23/06 12:59 AM, "Kees Brandenburg" <ctb@zeelandnet.nl> wrote: > > On 22-okt-06, at 16:06, Halvor Bjørngård wrote: >> >> BTW, Is there a maximum number of layers for gum, one book I have claim >> twelve or so, but have seen other claims of 20 .. ? > > Hi Halvor, > > The maximum number of layers is related to the strenght of the (rigid) > package of gumlayers and the constantly expanding and shrinking paper > fibers between wet and dry. I think 20 layersare way too much and only > possible on a rigid (non paper) surface or on a paper that is made > rigid by fixing it on a rigid surface. > > My still workable (= near maximum) number of layers is 6 or maybe 7, > but I try to do with less. > > I also am very much interested in the 'ferric' hardening of gum > especially from a environmental viewpoint. I'll do some experimenting > too! > > -kees >
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