oliver wrote:I would love to do more, but I think I may have overestimated the amount of rosin in the package :( I've dissolved the entire block and it's already all dissolved! So I think it's far from saturation :(
Oops, You can leave the container open and evaporate some of the IPA. For those planning to follow along at home. Add the IPA to the rosin slowly, and stop when you like the viscosity.
oliver wrote:So I've bought some glycerine from etos, 2.25E so pretty cheap. It's reasonably thick liquid, but according to the contents, it is glycerin and aqua (water i'm sure). Now I'm pretty sure we don't want water in our little mixture :) and thus needs to be removed.
Given the mixture ratio listed before (100ml IPA, 1.5ml Glycerin) I think you can safely ignore the water content of the glycerin.
With 96% IPA there is already water(#1). The rosin and IPA absorb water, they are hygroscopic (#2), glycerin might be but I don't recall.
1: ~4ml give or take some other contaminates, maybe some conversions and/or ratios, and my waning memory =P
2: http://en.wikipedia.org/wiki/Hygroscopy , it's the bane of a good brown-sugar/mollasses cookie =(