Sometimes a custom order requires frit that just isn't available. This means I have to make it myself, a process that leaves me cursing with tiny bits of glass flying all over the studio that Joe finds with bare feet. I just found the best way ever to make frit without investing in a special machine.
I blew bubbles of the desired colors in the proportions I wanted then popped them in a deep saucepan and crushed them with a hammer UNDER WATER! No glass flying all over the place. Most of the water poured right off and the little bit that was left was easily boiled away. Nearly instant frit!
Note that I used the saucepan Joe made rice in that had been burned so badly I had to use pumice to scour out the carbonized remains so I couldn't hurt the pan any more than it had been already. I wouldn't suggest trying it with something good.
Here is a picture of my test bead - no pictures of the process, since I can't trust Joe with a camera