[kokopelle2012]

I am working with Terracotta, making plant pots, and have a black iron oxide i've worked into a slip for creating black decoration on the unfired pots. i would like to do the same with white. My concern is that using a glaze essentially seals the clay, where what i'm hoping to do is color the clay without sealing it.
Does anyone know of techniques or products for this? What i found that i thought might work was a white mason stain mixed with a light body clay slip?
any advice is appreciated.
-isaac

[clay lover]

How about a white stoneware slip?

[Lucille Oka]

How about an Engobe? Take a look- http://www.amaco.com...-lead-free.html

[perkolator]

i'd say any white slip/engobe should work.

here's a versatile, basic white slip recipe:

25 Kaolin/EPK
25 Ball/OM4
25 Custer Feldspar
25 Flint

if you want it "whiter" you can sub for whiter clays, like grolleg; or even add an opacifier like zircopax or even tin.

[kokopelle2012]

you are all amazing! Such quick and knowledgeable replies! I will try these three suggestions in order of what i can get my hands on first. Thank you!

[kokopelle2012]

perkolator, on 13 June 2012 - 06:57 PM, said:

i'd say any white slip/engobe should work.

here's a versatile, basic white slip recipe:

25 Kaolin/EPK
25 Ball/OM4
25 Custer Feldspar
25 Flint

if you want it "whiter" you can sub for whiter clays, like grolleg; or even add an opacifier like zircopax or even tin.

I bought these things then realized I didn't ask, are they in ratio by weight or by volume?

[bciskepottery]

When the sum adds to 100, then it is usually by percent of weight.