Abstract
IN extending work on the recording of low relief in etched or abraded plane surfaces of rocks, minerals and metals by means of cellulose acetate moulds1, it has been found that the forms and distributions of narrow structural crevices and microscopic pits in these and similar surfaces can be accentuated, for detailed study, by filling them with a suitable pigment which is then removed by, and retained in, the thin cellulose acetate moulds made from these prepared surfaces (Fig. 1). For this purpose a dispersion of cellulose acetate in tetrachloroethane is convenient. Addition of an appropriate plasticizer to the dispersion minimizes the development with time of very slight shrinkage and brittleness in the resulting moulds.
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