Electric Mid&Hi Fired Ceramics
Steven Hill Oxidation Project
Achieving atmospheric glaze effects in electric kilns at mid-fire temperatures, through the layering of sprayed glazes. The starting point recipes are given in two discussions "Strontium Crystal Magic . . ." and "The Companion Glazes"
The Companion Glazes - Modifiers and Complements to SCM
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.
George Lewter
Melissa,
Strontium carbonate is much less toxic than many other ceramic materials. People often confuse it with radioactive strontium 90 from nuclear weapons.
Below is an extract from a materials data safety sheet for strontium carbonate:
V. HEALTH HAZARD INFORMATION
Effects of Exposure:
To the best of our knowledge the chemical, physical and toxicological properties of strontium carbonate have not been thoroughly investigated and reported.
Strontium compounds have a low order of toxicity. It is chemically and biologically similar to calcium. Strontium salicylate is the most toxic compound. The oxides and hydroxides are moderately caustic materials. (Sax, Dangerous Properties of Industrial Materials, eighth edition)
Acute Effects:
Inhalation: May cause irritation to the respiratory system, coughing and shortness of breath.
Ingestion: May cause excessive salivation, vomiting, colic and diarrhea.
Skin: May cause irritation.
Eye: May cause irritation and visual impairment.
Chronic Effects:
Inhalation: May cause pulmonary edema.
Ingestion: No chronic health effects recorded.
Skin: May cause dermatitis.
Eye: No chronic health effects recorded.
Routes of Entry: Inhalation, skin, eyes, ingestion.
Medical Conditions Generally Aggravated by Exposure: Pre-existing respiratory disorders.
Carcinogenicity: NTP: No IARC: No OSHA: No
Issues of food safety are extensively discussed elsewhere on this network (try the search box at the upper right of our full web page). The general convention for production potters is to use a completely non-toxic clear or white liner glaze on the food contact areas of functional ware, or to have stock, colored glazes that have had sample pieces leach tested by a qualified laboratory.
15) Cornell Iron Saturate **
Cone 6
Custer Feldspar
Flint
Whiting
Yellow Iron Oxide
Bentonite
2150
1450
700
700
100
Total
5100
Comments:
Use only as a second glaze for effect over a light glaze (egg shell, white SCM)
Cornell Iron saturate glaze has nothing dangerous to leach. It is a glaze you could use as a liner with more visual interest than clear or white. I often use C Harris Temmoku (another iron red) as my liner glaze.
Mar 8, 2016
Joseph Fireborn
Has anyone tried adding large amounts of iron oxide into jens juicy fruit? I am talking like 15-19 synthetic RIO? I am kind of curious what it would do. I am going to mix up a batch and fire it this weekend.
I am hoping that I can get a nice black with silver highlights from the concentration of RIO.
Sep 29, 2017
Norm Stuart
After trying different variations of Jen's Juicy Fruit, I concluded it was a glaze / over-glaze which needed to be used at higher temperatures than Cone 6.
At Cone 6 Jen's Juicy Fruit is more of an ugly brown engobe. Altering the recipe by adding more flux merely made it into an uninteresting brown glaze.
Like Weathered Bronze Green, Jen's Juicy Fruit began life as a Cone 10 recipe which should be suspect right off.
Sep 29, 2017