No issues, and the solution stayed stable for days. Once in solution they then added heroin and heated to check if there would be any issues with heating at this stage. The second attempt was using warm solution that heroin had just been cooked in this of course already contained citric, the crack smeared onto the bottom of the spoon and again wouldn't easily go into a solution The last attempt involved cooking the crack using no heat at all and just a small amount of citric, although this did take some time (which Jon admitted could have been shortened by pre-crushing the rock) it did become a clear solution. The interesting part was that no matter how much citric was added after this stage the crack would not become a solution again. The first attempt involved the crack being heated in water with no citric, the crack melted and floated on the water but as soon as the heat was stopped this quickly became a solid again (in just 14 seconds) Jon suggested that this could be the source of the idea that wax is used.

Crack spoon method