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Picking up unwanted mold texture
Posted: Sat Aug 23, 2003 1:39 am
by Mark Selleck
I just finished my first slumps using 1/2" float in some 16" diameter bowl molds. They came out well, BUT, around the perimeter 2" or so there is a "texture" that I'm guessing is created by the stretching of the glass and it's dragging on the mold. Kind of looks like devit, but I don't think it is. Can I eliminate it, assuming it is what I think it is, by "polishing" the kiln wash surface on the mold? Would a very fine wet/dry sandpaper, maybe 1000-2000 grit, work for such a task? Or am I going for the impossible?
Thanks for any and all help,
Posted: Sat Aug 23, 2003 8:37 am
by rosanna gusler
might be stretching of the tin. rosanna
Posted: Sat Aug 23, 2003 9:03 am
by Barbara Cashman
It's probably "bloom". Bert Weiss can give you all sorts of advice on this. But I've never been able to remove bloom, once it's been fired. Did you check for tin side? Coat the glass with a devit solution?
Re: Picking up unwanted mold texture
Posted: Sat Aug 23, 2003 9:24 am
by Bert Weiss
Mark Selleck wrote:I just finished my first slumps using 1/2" float in some 16" diameter bowl molds. They came out well, BUT, around the perimeter 2" or so there is a "texture" that I'm guessing is created by the stretching of the glass and it's dragging on the mold. Kind of looks like devit, but I don't think it is. Can I eliminate it, assuming it is what I think it is, by "polishing" the kiln wash surface on the mold? Would a very fine wet/dry sandpaper, maybe 1000-2000 grit, work for such a task? Or am I going for the impossible?
Thanks for any and all help,
Mark
I have learned to love this look. I have covered it up with frosted or colored organic bottle coating fired to 400ºF.
That kind of satin lace is more and more appealing to my eye. One possible solution is to fire the glass, tin side up.
Posted: Sat Aug 23, 2003 9:37 am
by ellen abbott
Bert, I love that...learn to love what you can't change or fix. Done it myself.
e
Re: Picking up unwanted mold texture
Posted: Sat Aug 23, 2003 12:57 pm
by Carol
Mark Selleck wrote:I just finished my first slumps using 1/2" float in some 16" diameter bowl molds. They came out well, BUT, around the perimeter 2" or so there is a "texture" that I'm guessing is created by the stretching of the glass and it's dragging on the mold. Kind of looks like devit, but I don't think it is. Can I eliminate it, assuming it is what I think it is, by "polishing" the kiln wash surface on the mold? Would a very fine wet/dry sandpaper, maybe 1000-2000 grit, work for such a task? Or am I going for the impossible?
Thanks for any and all help,
I had something similar with float, only it was just an inch or so of marking around the perimeter on the underside. Solved the problem by going to a stainless mold (you don't say what you're using) and cutting my blank smaller so the blank fits inside the mold, rather than sitting on the rim of the mold. I've never been sure which variable solved the problem, although I suspect the smaller blank was able to move immediately instead of stretching first.
Carol