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Soak for at least 55min. This will spread so if size is an issue, cut glass smaller or block up edges. Use a clear coat or Borax solution to prevent the devit on surface. Tin side down only helps prevent sticking to kiln shelf.

I often sandblast a light "sprinkle" of coarse grit on the surface of layers of plate glass and fuse them together to trap the bubbles for an effervescent effect. These bubbles are much bigger than what you are describing but it certainly makes sense that the haze you are wittnessing can b...