Potters & Sculptors - Making Rock from Mud
These are the glazes that Steven introduced us to for creating the layered effects for which he is renown. This is the place to post modifications for these glazes, and other glazes that you have found to work well with SCM and SCM for orange.
2-D blue sprayed very thinly over the other layered glazes can produce a "snowflake effect.
And following are companion glazes that Steven has used on his pots.
You definitely have to do the slow cool & holds in order for the iron crystals to form. There have been several articles linked on this forum to discussions about getting the iron reds. I likewise have gotten good results on a test tile that did not translate to a pot. I have found that they are easier to get in my smaller Skutt than my larger L&L. Of course the smaller kiln was a little more packed that my bigger one, so I'm sure that also comes into play. You just have to find the sweet spot. Jeff
Thanks Jan. It seems I can never find stuff on these sites.
I have a question regarding the Hanna's Fake Ash glaze recipe that is included with Steven Hill's video. If this has been addressed already, I apologize. I searched and could not find anything about it.
The recipe on the video's glaze list is not the same as the one you have listed here. It is:
Hannah's Fake Ash
Strontium Carb 10.1
Redart Clay 56.1
Frit 3195 4.8
(it says this adds up to 100, but it doesn't. It is 122.7)
Red Iron Oxide 3.3
Yellow Iron Oxide 2.8
My question is, is this a typo, or has this been altered from the original version by adding the silica and the 3195?
This was under another topic:
Actually, the silica isn't too high for a cone 6 glaze. It's 2.4 and the minimum in my Insight for cone 6 (non copper bearing glazes) is 2.5. For a copper bearing glaze it would be even higher. The whiting is quite a bit higher than recommended for cone 6. Also, the silica alumina ratio on this is over 11 which would make it a gloss and the original Hannah's is a matte.
You might want to write Steve and get the correct recipe; and maybe you can post the correction here. It would be interesting to see where the error was.
Thanks June. I have a question pending to Steven, but thought maybe it had already been discussed somewhere here. I'll just wait patiently for him to answer. I know he's busy.
Hm . . . You're right, June. The Hesselberth and Roy cone 6 limit formulas also set 2.5 as min. I had thought the silica might be out of whack to facilitate the formulation of the characteristic rivulets. Here is a side-by-side comparison of the new cone 6 version with the older cone 9 version. Notice the SiO2 in the original is only 1.54, and that was for cone 9.
I've yet to try the new version, but with the base recipe now totaling 122.7, one wonders if the colorants which are normally percentages of total are to be percentages of 122.7 (needing to be recalculated) or absolute as-is values (as if the silica were also an additive, rather than part of the base glaze). I just looked at the PDF recipe document from SH's DVD and silica is listed as a base ingredient, but the total is wrong.
I just came on board seeking an answer to this very question of 122.7%. I have concluded that the addition of 22.7 parts silica is an error. It doesn't make sense that Steven's refinement process noted above should suddenly see the addition of this amount of silica.
Arthur, that amount of silica is actually 0.1 moles less than the minimum for a good, cone 6, non copper bearing glaze limit. Sometime people add things to a formula and don't bother to bring it up to 100%. Since that glaze has no spar, or wollastonite to contribute silica, most of the silica has to be added alone. And of course it could be an error; but in that case, it would not be a very stable, functional glaze.
What I can see is:
That fake ash was actually very thick, and still did not run. I was afraid I would be cleaning shelves, because it was so thick, but no. I do like the golden color though. I should mention that this batch was mixed without any colorant. Perhaps adding the iron would encourage a little running, but I doubt it would be much.