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Though most decent rock just vaporizes into the screen, occasionally swim finds some rock tends to catch fire and create a flame at the end of the pipe (assuming a glass tube and screen). What causes some to catch fire? Is it a cut of some kind? Something in the preparation process (too much baking soda, etc)? Possibly just wet?
...or is this just another case of "it could be anything"?
swim finds this normally happens with crack that has been made with amonia and not bicarb. and the resulting crack has offen not been rewashed to get rid of any exsess amonia. if swiyou find there crack is ever slightly yellow it more than likely has amonia innit.
Perhaps there are other reasons as well, but one reason with rock that has been cooked with sodium bicarbonate appears to be too much bicarbonate or cut -- simple purification to remove some of the baking soda and cuts results in a smaller rock, but it no longer catches fire.
He beleives it is more likely to happen when there isn't enough airflow into the pipe - maube because of a partly blocked screeen or just not using enough lung power.
That may be in some cases, but swim has noticed that good stuff will melt completely into the screen when pre-melting and heavily cut stuff will leave residue on the glass (some stuff doesn't melt into the screen) -- swim has found that this residue that is left on the glass often catches fire.