Sedef Posted July 7 Report Share Posted July 7 Hi, I’ve applied PC023 Indigo Float, PC021 Artic Blue, PC027 - TOURMALINE and Frosted Turquoise (PC-28) on 4 cups as seen in the picture. The cups were fired at 950 Celcius and and second fire was 1250 Celcius. How it is possible to deep blue glazes turned to all green after glaze firing? Do you have any experience with that? https://ibb.co/L83fPCC https://ibb.co/59nv60v https://ibb.co/bWbPJcz https://ibb.co/yYhwmB1 https://ibb.co/zHfxpfM Quote Link to comment Share on other sites More sharing options...
Min Posted July 7 Report Share Posted July 7 (edited) Hi Sedef and welcome to the forum. Looks like all the glazes you used are recommended to be fired to cone 5/6 which would be approx 1200C tops. It's quite common to the the first (bisque or biscuit) firing to cone 04 (approx 1060C). A few things that can have an effect on how a glaze colour turns out. Claybody the glaze is used on, most commercial glazes are tested on buff or light coloured clays, darker clays will have a different look to the colour of the glaze. Glaze thickness and temperature / cone fired at are also factors. edit: if your clay is a high fire clay then you would either need to use high fire glazes and keep firing the glaze fire how you are, or find a clay that matures at midrange, cone 5/6 for those glazes. Edited July 8 by Min Temp typo Callie Beller Diesel and Sedef 2 Quote Link to comment Share on other sites More sharing options...
Kelly in AK Posted July 8 Report Share Posted July 8 Of all those glazes only indigo float looks like it doesn’t have a green tendency in it. The others vary with thickness. Certainly the clay underneath will affect the color. The speed of firing will also affect it, sometimes significantly. Using physical cones will help you know what’s really going on in the kiln. If your kiln is plodding along at 60°C/hour for the final hundred degrees, then 1250°C is cone 8. Sedef and Bill Kielb 2 Quote Link to comment Share on other sites More sharing options...
Sedef Posted July 8 Author Report Share Posted July 8 Thank you so much for your answers. The clay was light creme color. I think I need to check exact Celcius degree that corresponds to the cone value. I thought that 50C (1200 to 1250) don’t make any significant change but I guess I was wrong😅 Bill Kielb 1 Quote Link to comment Share on other sites More sharing options...
Babs Posted July 8 Report Share Posted July 8 How are you applying them? Might need to stir the glazes really well. The bowl second from top shows a gritty clay...yes? Quote Link to comment Share on other sites More sharing options...
Kelly in AK Posted July 9 Report Share Posted July 9 A temperature correlation to a cone is dependent on the rate of temperature rise, very important distinction! TonyC and Bill Kielb 2 Quote Link to comment Share on other sites More sharing options...
Chilly Posted July 25 Report Share Posted July 25 On 7/7/2024 at 10:53 AM, Sedef said: PC023 Indigo Float, PC021 Artic Blue, PC027 - TOURMALINE and Frosted Turquoise (PC-28) There are a couple of Facebook groups that are all about Amaco Potter's Choice. You might find the answers there. https://www.facebook.com/groups/potterschoiceex/?locale=en_GB https://www.facebook.com/groups/1196799951019423/posts/1398359354196814/?paipv=0&eav=AfYmtsC5RDwv16Y9pNgwJ88wvmZH7oa9E8J-q3IfRhBSV0tKYkLZafWNK7u0TEseK9w&_rdr Quote Link to comment Share on other sites More sharing options...
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