If glaze is applied too heavily, the consequence can be seporation of the glaze from the clay. It looks as if the glaze crawled away from an area. It may look like the remnent of a greasey finger print. Bisque clay readily absorbs oil from finger prints, nose or elbow bumps. These are commons reasons for the glaze to crawl away from an area ; leaving bare spots on a glaze fired piece. For more information: TUTORIALS CRAWLING TUTORIAL
When the fired glaze retracts to expose the bare body.
A condition where fired glaze separates into clumps or islands leaving bare clay patches showing in-between. More prevalent in once fired ware. There are many causes for crawling (typically glazes shrink too much during drying and don't have a good bond with the bisque) in the Magic of Fire book. Some times glazes are made to crawl intentionally. One technique to make this happen is to add 15-20% magnesium carbonate (testing required to determine amount) to a low fire transparent glaze.
Glaze that has pulled together and beads up, leaving a bare spot of the bisque. Also called separation.
A flaw characterized by dry areas of a finish pulling or floating away from wet areas.
A bare spot (from the shrinking of a glaze) on a finished piece where oil or grease prevents the glaze from adhering to pottery.
The condition of the wet film crawling or pulling away from the different areas of a substrate. This normally happens when the surface has been contaminated.
Pulling away of a coating film from the original dimensions of the coated area. Creeping, Fish eyes, Pull-back, Shrinking.
When a coating applied tends to flow away from areas leaving them uncoated. This is usually caused by grease or oil contamination of the surface to be coated.
A bare spot (due to shrinkage of a glaze) on a finished piece where oil , grease or clay dust prevents the glaze from adhering to ceramic piece.
The tendency of a liquid to draw up and bead on the surface.
The tendency of a liquid to draw up into drops or globules as a result of an abnormally high degree of surface tension and/or - as a result of - a vary hard, slick, or greasy surface where the normal surface tension of the liquid draws the liquid up and exposes the surface.
That property of a coating or ink in which the wetting of the surface is very poor, causing the film to contract into drops, leaving a discontinuous covering.
Defect of poor adhesion; may cause to gather up in globs.
Coating defect: tendency of a wet paint film to recede from certain areas of a painted surface. This substrate de-wetting can be induced by a substrate contamination.
Glaze which pulls together and beads up, leaving bare spots of bisque. Also referred to as "separation."
Aparting and contraction of the glaze on the surface of ceramic ware during drying or firing, resulting in unglazed areas. Caused by too heavy application of glaze or from uneven contraction rates between glaze and body or by dust/dirt on the unfired bisque surface.
A defect in wet paint or varnish film where it recedes from small areas of the surface, leaving them apparently uncoated. Crawling is caused by an incompatible film on the surface.
a part of the underlying clay surface that is exposed when the glaze separates from the body.
refers to a glaze defect in which the glaze pulls away or crawls away from the bisque, leaving bare bisque areas.
Areas of a wet film where the coating material recedes or 'pulls away' from the surface.
Movement of glaze over the body surface during the glost firing stage, due either to dust or grease on the surface or over thick glazing or excessive colloidal material in the glaze.
Varnish defect in which poor adhesion of varnish to surface in some spots causes it to gather up in globs.
Shrinkage or retraction of the glaze during firing, causing exposed areas of body.
Glaze that has separated into mounds on the clay surface during firing, generally caused by fluffy or high-shrink materials in the raw glaze; sometimes called alligator glaze.
The cohesive effect of ink into drops after printing onto a surface which the ink does not wet completely.
Uneven texture of a paint surface, which can be caused by shrinkage while drying.
When an applied coating has the tendency to flow away from areas of the surface leaving them uncoated. This is usually caused by greas or oil contamination to the surface which has been coated.