"Can Glycerol be used instead? It's got a way higher density (1.26 g/cm³) compared to Propylene Glycol (1.04 g/cm³). So a much smaller amount of Glycerol should do the same job."
"I found out that adding one or two drops of dishwashing liquid will cause the lava blobs to merge much more easily as well as leading to overall smaller and 'stringier' blobs..
Had to replace the master fluid in a vintage mathmos jet lamp…"