bubbles.org. In this one we investigate the bubbliness of using karo light syrup (less expensive) than glycerin. Formula = 150 g tap water + 15 grams ultra Dawn + 5 grams Karo. Then we blew through a 3/8" id tube to see how much it bubbled. Looked about the same as the forumla with glycerin instead of Karo.
Still need to try distilled water instead of tap (although most city water supplies are pretty soft). And here are some of the bubbles I scooped off the top and blew around the kitchen. A littel messy, but fun.