you can use :
Crocus Martis ( spanish red iron)
Soda ash
red iron oxide
mang dioxide 200 mesh
cobalt oxide
nickel carb
iron chromate ( makes green)
chrome oxide ( hard to melt)
black iron
copper carb
tin oxide only if its black and probably is white.( stannous vs stannic oxide)
borax
the rest is either clay stuff or won't go into cullet. wet the frit very slightly with a spray bottle and add chemicals/ You are but the latest generation to try this. Have fun.
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