Re: Standard strength gum
Dear Ed, I did a lot of monkeying around to get a "standard" gum mix a la 14 baume. Depending on the gum's absorbency, it can vary 50g per liter! What was "standard" back in the 1890's was a "2 in 5". That works great. I found that when I mixed 24g into 84ml water that made 100ml of gum with the powdered--not quite the 2 in 5 standard, but it works great, too. You don't have to be so putzy, tho--use 30 + 90, for instance, which is a 1+ 3 or mine which is more like a 1 + 3.5 or the 2 in 5 which is a 1 +2.5. Demachy used a 1 + 2 (2 in 4). So there you have it--a range of 1 + 3.5 to 1 + 2. Weight in grams to ml water. Chris ----- Original Message ----- From: Edward Draper <ercdraper@gmail.com> To: alt-photo-process-l@usask.ca Subject: Standard strength gum Date: Tue, 06 Oct 2009 20:44:19 +0100 >Hi guys > >I've managed to get myself addicted to gum printing - I use >powdered gum (from Silverprint here in the UK) > >And I mix it straight into my pigments - I get a lovely mix >that is wonderfully variable and leaves beautiful brush >strokes across the page > >I love the effect - but it is very variable and uses up a >lot of paper in wasted almost-right prints > >I've been playing around with premix the gum with water >I've just tried 5g in 100ml > >I see in the latest email trail the following: > >"5 ml of gum (I assume standard strength)" > >What is "standard strength gum"? > > >Thanks > > > >Edward > |