Topic: Security Central / How do they get the ash to make tats?

I’ve been working at the local county jail for about 7 months now, and have seen the tats that are made in there using ash and V05 shampoo. To get the ash they burn something underneath there bunks or inside the small locker and take the soot/ash that has accumulated on the top. What do they use to burn what they are burning? And what are they burning? Is it the pencil’s lead? I don’t think it’s a stinger because they use that to get things warm, but is it warm enough to catch things on fire given they still have to take the fire and place it near there bunks. I’ve been told they use a lighter or matches but I really don’t think they have these items, our shake downs never turn up lighters or matches. The inmates are under direct supervision, but I do understand some officers are lazy and may not catch things like this.