Donna: I tried the slow cooling method and still ended up with the UGLY brown that is in the photos I uploaded. I spent 2 years working on iron reds and never got anything I was happy with. I may try again on my vented kiln, computer controlled...I have to have some success elsewhere before I get the courage to go at it again! LOL...
This is way late in responding and I doubt that it is of much use but regarding the inability to get red out of the glaze "Randy's Red", when they changed talc on us our version of this glaze went from red to ugly brown. I tried any number of adjustments to make up for the change of talc and it turned out that the only solution was to add bone ash. I settled on about 2%. Most saturated RIO glazes have this in them.
Donna Kat
The Black Stain posted in Glaze and Clay comes from this article
http://www.ceramicartdaily.net/booksales/Electric_Busch.pdf
which is a cone 6 electric firing. I would only be guessing the range but I would think it fairly broad.
Jun 30, 2012
Nadine Mercader
Donna: I tried the slow cooling method and still ended up with the UGLY brown that is in the photos I uploaded. I spent 2 years working on iron reds and never got anything I was happy with. I may try again on my vented kiln, computer controlled...I have to have some success elsewhere before I get the courage to go at it again! LOL...
Jun 30, 2012
Donna Kat
This is way late in responding and I doubt that it is of much use but regarding the inability to get red out of the glaze "Randy's Red", when they changed talc on us our version of this glaze went from red to ugly brown. I tried any number of adjustments to make up for the change of talc and it turned out that the only solution was to add bone ash. I settled on about 2%. Most saturated RIO glazes have this in them.
Oct 30, 2015