デッサン用品
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Crayon test pH
AC-CO0005
通常価格: $14.15
Special Price $9.95
Easy PH testing pen, if the pencil leave a mark on the support it means that the surface is alkaline so conservable in time. In other part, if the pencil leaves no mark, the support is acidic. Acidic support should be avoided at all cost because they will deteriorate and change in time. For more information, see detailed description section. もっと知る