Quote Originally Posted by clay
The pre-mixed stuff I get from B&S pours about like the light colored Karo syrup. Definitely has more viscosity than sugar water. Check out Sam Wang's article about tri-color gum on www.unblinkingeye.com. I believe he mixes his own gum solution from dry gum, and if I remember correctly, he outlines his procedure.
Well there you go, make a solution that pours like Karo and go from there. I doubt you have to be exact in this process. The people who were doing it 80 years ago probably did not use a hydrometer...