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Cold characteristics: Although termed an opal due to its almost total lack of light transmission, this is (in terms of its composition) actually a transparent glass. Working notes: Low viscosity. Will flow sooner and more than other glasses. In very thin sections the colour may vary from reddish/gray to bluish/gray.
Cold characteristics: Partly transparent. Slight dappling of colour. Working notes: Opalizes upon firing. Slight dappling apparent in transmitted light.
Cold characteristics: Colour variations common from red-orange to terra-cotta. Frequently lightly streaked and with yellow mottling on back of single-rolled sheet. Working notes: A cadmium/selenium glass. Can react with lead-bearing glasses or overglazes. Possible reactions with 001311, 001215. Much colour variation typical upon firing. If specific colour is important, always test before beginning project. Use glasses from same dates. Do not assume that sheets of the same colour when cold will fire identically.
Cold characteristics: Some light/dark variations common on surface. Working notes: Light/dark variations generally disappear on firing. Dark interface reaction likely with sulfur glasses (001137, 001437, 000137).
Cold characteristics: May appear partly transparent with wide variations in colour density. Overall look of a lighter, brighter yellow such as 0120. Working notes: Matures to an opaque marigold yellow. May appear slightly dappled.
Cold characteristics: May contain variations in colour density. Working notes: Matures to pumpkin orange, which may contain slight colour variations.
Cold characteristics: A supersaturated chrome glass with metal flake glints in reflected light. Working notes: Stable. No color shift.
Cold characteristics: Varies slightly from lighter to darker shade; sometimes with lighter dappling in single-rolled sheets. Working notes: Colour will almost always deepen on firing. Possible dark interface reaction with selenium and/or sulfur glasses (001122, 001125, 000124, 000125, 001137, 001437, 000137). Less viscous (softer) than most other glasses. Some striking glasses like this one need to be fired slowly during the initial stages of the firing cycle. If fired too fast they may not strike at all, or they may strike, but appear spotty and have a blue-brown cast as opposed to the desired target colour. A standard full-fuse schedule should work to strike these glasses.
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