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Lead-glaze - A clear glaze containing a lead component. Nowadays lead must be used in its non-poisonous bisilicate form.

Leather-hard - . . . or cheese-hard. Clay that has dried to the point where it is stiff enough to retain its shape but wet enough for further work to be done on it.

Limestone - Chalk. Used in lime glazes.

Loop, Endless - See Endless loop.

Lustre - Metallic oxide film applied to pots after glazing and firing to produce pearly finish after a further firing in a reducing atmosphere.

Lute - To join two pottery surfaces together with slip.