Yes. You “bake” the painted glass pieces, so the paints harden and they can be gently washed by hand. We do not recommend putting these pieces in the dishwasher or using scrubbers on them.
Forgot your baking instrustions?
Place your glassware in a cold oven. Preheat oven to 325 degrees. Bake for 30 minutes. Turn off oven and let your glassware cool. When it is cool remove from oven.