This paper deals with so-called all plastic two-step replica method, contents are as follows.
(1) The critical condition for preparation of each 1st step plastic material for practical use was decided.
(2) Collodion as 2nd step plastic material is of better quality than the others.
(3) The newly developed method, which making use of technique with cellopane tape, gave excellent reliability and less defects in comparison with the others.
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