Abstract

SUBSTANCES based on gelatine or agar-agar are used extensively for making moulds, from which replicas can then be made. In order to use the process of electroforming in conjunction with such jelly-moulds, it is necessary to provide the mould surface with a conductive layer. As agar composition, for example, contains about 95 per cent water, it is obvious that the moulds cannot be submitted to drying without causing deformation, and the usual method of coating moulds with aqueous colloidal graphite is therefore inapplicable.

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