In decorating, pinholing is a defect in a painted or varnished surface characterised by minute craters or 'pin holes' in the film which are slightly rough to the touch and allow the passage of moisture. Pinholing may be caused by incorrect application or shaking of the varnish resulting in tiny air bubbles occurring in it. In spray painted surfaces...
Found on
http://www.probertencyclopaedia.com/browse/TP.HTM
When gas bubbles out of the glaze it can cause masses of minute holes on the surface. Usually due to mineral impurities.
Found on
https://ashbrook-ceramics.co.uk/pottery-glossary/
Small holes (unwanted) in printed areas because of a variety of reasons.
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https://www.encyclo.co.uk/local/20631
Failure of printed ink to form a completely continuous film, visible in the form of small holes in the printed areas.
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https://www.encyclo.co.uk/local/22539
Small dots of unglazed or depressed areas in the glaze surface. Usually unwanted, pinholing occurs when gases in the glaze and clay bubble up to the surface. The bubbles pop and a 'hole' appears, which doesn't fuse over.
Found on
https://www.hot-clay.com/clay-glossary
No exact match found.
