Straining Gum: The gum mixture I was left with had a great deal of sludge and impurities still left in it. I made a strainer from a clean baby food jar and a single length of panty hose stretched over its opening. Moistening the hose with a bit of water helps break the surface tension, and I poured the gum mixture through a bit at a time, pushing the sludge around the hose with a spoon to strain as much of the liquid as possible. I had to replace the hose several times as the impurities built up in it, and after an hour or so of straining, ended up with little over a tablespoon of what looked like cream. Adding a drop of red watercolor ensured that I would be able to see the dried gum once on the page. I stored it in the refrigerator for several weeks before it began to mold.