iandol on thu 15 may 03
Dear Pamela Watkins,
If you are feathering you decorations then I would assume that you are =
flooding the well of each plate with one colour and piping other colours =
across before applying the feather to pull the pattern.
My thought is that your porcelain slip has and excessive shrinkage =
factor in comparison to your leather hard clay. Since your slip is low =
in clay it will not have the sticking power needed to make it adhere to =
the substrate. Your Prof. may be correct about rapid drying but that =
only provides the impetus not the cause.
The problem is to get a good fluid slip with the minimum amount of water =
in it. My suggestion would be to use a deflocculated slip which has been =
allowed to thicken to the correct degree that will ensure good flow =
during patterning. A flocculated slip has an over abundance of water.
One of the constant points which is reinforced time and time again in =
Clayart Posts is to dry slowly on all occasions to prevent or alleviate =
all forms of cracking to the Greenware stage.
Hope you succeed in a few days.
Best regards,
Ivor Lewis
Pamela Watkins on fri 16 may 03
Brilliant!!!! Thank you for your response. I believe deflocculation might be the key, although some plates made it and the platter didn't. I just read a supurb article on terra siq in CM that I as thinking of trying, before; now it's a must. I just typed with another responder and I thought of a solution- slip the whole plate. I was just slipping the base where the (as you accurately described) feathering was to be. But I don't want to add weight, of course. Think I'll do the terra sig.
Have a great weekend and if you think of it, wish the Rain Gods out of Georgia for me,I'm doing a "crappy art show"!
-Pamela aka Jaq
iandol wrote:
Dear Pamela Watkins,
If you are feathering you decorations then I would assume that you are flooding the well of each plate with one colour and piping other colours across before applying the feather to pull the pattern.
My thought is that your porcelain slip has and excessive shrinkage factor in comparison to your leather hard clay. Since your slip is low in clay it will not have the sticking power needed to make it adhere to the substrate. Your Prof. may be correct about rapid drying but that only provides the impetus not the cause.
The problem is to get a good fluid slip with the minimum amount of water in it. My suggestion would be to use a deflocculated slip which has been allowed to thicken to the correct degree that will ensure good flow during patterning. A flocculated slip has an over abundance of water.
One of the constant points which is reinforced time and time again in Clayart Posts is to dry slowly on all occasions to prevent or alleviate all forms of cracking to the Greenware stage.
Hope you succeed in a few days.
Best regards,
Ivor Lewis
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