Summary of a question: Frit made in an electric coffee grinder and cleaned with
magnet still produced black specks in the finished piece. What’s happening?
Most coffee
grinders use stainless steel blades. Most culinary stainless is not magnetic. So, you
are left with flecks of steel in your powder that the magnet cannot remove.
My experience with homemade
powder has not been positive. This has led me to buy powders. But I still use
home-made frit. You can wash and sieve out the powder and steel particles at
the same time into a bucket or basin. This will leave you with clean frit from
fine to as coarse as you want.
Do not put the
residue down the drains. It will block your drains after a time. Instead, you
can let the glass settle to the bottom of the bucket and pour off the clear water. Let the remaining
water evaporate, and wrap up the sediment for waste collection. Or if you have
a garden, you can empty the water and sediment onto the ground. It makes for
good drainage over time.
The contamination
in home-made glass powders make it best to buy powders and make your own frit.
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