An air stone is going to make tiny little fizzy bubbles, and probably will clog. Try the open end of a 1/4" aquarium hose. Maybe make a circle of T fittings so there are several bubbling outlets.
Quick question on a buubling effect.
My wife and I got a commission from a woman in our town who wanted a cauldron like I made in the craft section for her small haunt. Instead of a fog machine she wants an actual liquid that will bubble so I figured we could just run a bubble stone like used in a fish tank and a small pump to get the effect. However it doesn't give the thick slimy bubbles that she wants with just water. Any suggestions on what to use? I thought about corn syrup or mayber dish detergent dyed but that that might be a bit of a mess to clean up. Attached is a picture of the cauldron currently.
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It still needs paint and a few touch ups before the liquid goes in.
