How do you fix hairline cracks in pottery?

Clay has a memory. So in an effort to erase the memory of a crack, score the area in question deeper and larger than the crack itself (2), then place a bit of scored soft clay into the space youve made and compress it with a rib (3, 4). This will heal a crack in most cases, depending on how dry the cracked clay is.

How do you fix a hairline crack in bone china?

The idea is simple. You place your cracked piece in a pot and cover it with two cups of milk (or more if needed). Next, heat over low for an hour. Allow to cool in milk and then remove and rinse.

What causes hairline cracks in pottery?

Pottery fracture results from stress within a ceramic body due to thermal expansion and contraction, shrinkage, and other forces. Poor drying or uneven compression and alignment of particles can result in low strength.