U of S | Mailing List Archive | alt-photo-process-l | Newbie Gum fun!

Newbie Gum fun!

Hi all,

I've just had my go with coating a pad of Arches Smooth paper 300gsm 100%cotton, I sized one piece in hot water first(no gelatin), but as I did this, I started getting speckled dots around a mm, which were lighter than the paper, they covered 3/4 of the paper?  I tried another piece of paper with a hot gelatin solution(no hot water sizing at all) and put it in the tray, where I got the same result of speckled mm dots?!
I've tried using a Rough Fabriano Artistico paper with both the hot water and gelatin sizing, no problems at all there.
Anyhow I hung the Arches to dry last night, I havent as yet checked the paper this morning. 
Perhaps there is an issue with the Arches paper and I should take it back to the seller?

I have bought the powder form of Gum Arabic, its a straw yellow.
I tried two methods, to make a 35% solution in 100ml (35g of gum). 
The first method was to use a coffee filter and put 35g of that in there and poured distilled water to make 100ml out of it. There was one big gooey mess in the filter. Which I threw away once I got my 100ml. 

The other method was to put the gum 35g in 100ml of water, when I did this I thought there was no way the gooey mess will actually dissapear, but as an hour or so progressed it started slowly disappearing! :) I'll check on it tonight, and might pass that 100ml through a coffee filter to see if any sediment is caught and throw that away.

What methods do you use to make a solution of gum arabic from powder?
Many thanks
Jacek Gonsalves