WHY did some glass plate I painted turned milky when baking the paint?

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So, I am making ForeverFlowers using vintage glass and plates. Some of my glass or even crystal I paint to add some colors.

Usually, I bake on the paint by placing the products into a cold oven, turning it to 350, and bake it for about 35 minutes after temperature is reached. I then turn off the oven and let my work cool down slowly in the oven.

One of my painted plates turned milky and I had to brush off some fine dust with a toothbrush. Still, it remains milky.

Could this be a lead crystal plate?

Any clue at all before putting my next batch to bake?

Much gratitude for suggestions.

q why did some glass plate i painted turned milky when baking the paint

The glass here used to be clear before baking like the other flower you can see

q why did some glass plate i painted turned milky when baking the paint
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