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Rfobri

Unglazed white slip & underglaze discoloring with time

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I’ve been experimenting with making low-fire red clay plant pots, using a white slip and carvings for decoration. I’ve left them unglazed because I’d like them to breathe. However, I’ve found that the white slip discolors within a week or so of watering (it gets greenish brownish). I tried a commercial white underglaze instead, and it seems to have the same issue. Any thoughts on ways to get around this, other than staying away from the slips altogether?

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Low fired, unglazed clay will do this.

I have (commercial) red terracotta plant pots, and they change colour quite quickly when they are damp.  They leach out salts, from the clay, soil and water, they grow moulds.

 

Can't imagine any way round this at low-fire temperatures.

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