Retxy

Hi there smart folks! I am hoping to see if anyone can recommend any books or resources (free is nice, but not required) that explain limit formulas for the development of durable/food safe low fire glazes. I now feel confident after having read mastering cone 6 glazes that I am at least in the ballpark of safety when formulating glazes for midfire temps ( with testing to follow of course). But I have zero clue as to how to go about formulating recipes for low fire, where the stakes seem higher given clay isn't vitreous. I really wish that I could keep working with stoneware, but the cost to fire is now prohibitive for my life circumstance, so trying to see what the world of low fire can do for me so I don't have to give up the only source of sanity now left to me. Thanks! Ret

Yes, several times. The underglaze was prefired at bisque (applied while piece was green)

Can anyone recommend a recipe for a super flux that can help pull a glaze off of a currently obscured underglazed surface so I can see it again? Thanks!!!

Ret is retxy on a computer. For some reason I can't log in to the Ret account on my laptop. Thank you SO much for this kind help you have given me. I appreciate the input and am relieved that the loss of a few coils shouldn't mess me up too badly. These mama jammas ain't cheap!!!!! Thanks! D

Thank you Min!! Sorry I came back so late! Life...

Answered in an older topic. Thanks! Does anyone know where I can find the kiln sitter informational post posted by Neil? Thanks!

I thought a quick Google/forum search would answer how one should tackle element replacement on a kiln who's manufacturer is out of business but alas.... Here I am bother you all. How does one go about getting the right element for a discontinued kiln? Thanks everyone for your kind help. D

I have found those little toolbars indispensable actually. They give me soemthing to shoot for at the very least, along with the hard and fast rules that I learned in MC6. I really like this fucntion. I haven't figured out if there is a custom levels area yet, which would be useful if there is a set of parameters that one likes to reuse often, but if its there I will find it. have you found that when going by the COE given by hyperglaze that the glazes you produce with it generally do well on your clays? I would think that would be testament enough. I don't know if you get your ware professionally tested, or if COE calculation can even be ordered with tests for durability (pretty sure those are two different processes) but it would be so cool if you have data. THANKS SO MUCH EVERYONE. This community is a lifesaver

I agree and I hardly know what I am doing. I tried to use the USE column to force what I wanted but it didn't work for me. I have been using glazy for the calculations then entering the recipe into hyperglaze to get an estimated COE for the glaze, which I haven't found a way to do in glazy. Also, hyperglaze does not do r20:ro, so even when I am using hyperglaze calculator to figure things out for me, I still have to enter it into glazy to get these, because I tried to manually calculate but was too... ahem dumb... to figure out how. Also tried to calculate coe manually and was getting huge numbers. so hyperglaze has helped with that! I am going to try what @neilestricksuggested, and see if this will make a difference for me. I kept wondering why the program would stop calculating when there were still two ingredients left in the list of the recipe after using sort, but now I see this was just because I had met the limits. At least i think! Thanks again so much for all being willing to share their knowledge. so very appreciated

This helps more than words can say. THANK YOU SO MUCH!!!

Bill, If no one has ever told you that you are amazing, please know that you are. I can't thank you enough for your help with all of this!!! I have been playing around withthe katz spreadsheet just now, and the numbers i'm getting are vastly different from what hyperglaze is saying. So much fun. I can't wait to watch the videos you posted. Thank you!!

a little background, the original recipe had FFF feldspar, but I'm trying to sub mahavir and failing miserably. original recipe: https://glazy.org/recipes/9792

Am i missing this in hyperglaze? i have attached a selsor chun recipe that I am working on but i keep getting a message that potassium and sodium are undersuppplied but the ratio of these two is in a good range. so frustrating. but i don't see the r20:r0 ratios. I can switch to glazy or the katz website, but I went with hyperglaze bc mc6 recommended it. Is it there im simply not seeing it? Thanks!

Bill the r20:r0 ratio is a new concept for me. I have hyperglaze and am struggling to learn it. I don't see this as an offered ratio is this just something I get to calculate by hand? Thank you for your rapid replies and kind help!! I am so grateful

Bill the r20:r0 ratio is a new concept for me. I have hyperglaze and am struggling to learn it. I don't see this as an offered ratio is this just something I get to calculate by hand? Thank you for your rapid replies and kind help!! I am so grateful

Thank you so much for this! I'm scare now, but better to know now instead of later.

Thank you SO much for this insightful reply!! Is getting to know each oxide just a matter of reading through the digital fire profiles on each or is there a resource that you have found helpful? I did not know that about manganese and honestly would not know where to pick up little tidbits like that. I am struggling just now to learn how to do substitutions and not understanding what I am working with, so any resource you have found helpful I would welcome. I have MC6 and have found it useful, but aside from giving limits, there was not enough room for discussion of each of the recommended materials. Thanks so much!!

for hyperglaze users, why do excesses of different oxides present with negative numbers and in red in the unity formula? I am not sure why an excess would produce a negative number, unless i am missing something with the scientific notation? I feel rather stupid. and also, why must I be forced to use the calculation function instead of manually adjusting the ingredients myself? Is there a way around this? Thanks SO much! If there is a better place to post this, please let me know.

Bill, Thank you so much for your wonderful reply!!! You correctly deduced that I was referring to masteringncone 6. Thank you so much for that article as it clears up a lot of things for me. I agree that there are certain things that I also will not stop in my glaze chemicals, but was wondering if there were published standards somewhere as far as the leaching of other chemicals and if this was regulated. For example I did not know that over 5 mg per liter of copper bleaching gave food a metallic and bitter taste until I read mc6!!! And though the authors give some ranges I had wanted to know if there was some regulation that someone knew of from the FDA or others but now that I see that even Mako is only really concerned about lead and cadmium and I have learned enough on what to avoid ( batiumd, vamnadium lithium etc), I feel more confident!!! Thanks so much!!!

Hello people much smarter than me! I recently read mc6 and my mind has been blown. So much I don't understand. However I am barreling forward regardless! My question is: when a large company labels a glaze food safe are they only required to use the leaching values for lead and cadmium? I understand the rules for toxic vs nontoxic, but not if these companies are using limit formulas for other items besides cadmium and lead. If there are other standards they are held to, where could one find these published limits? Mc6 states that one can make their own guidelines but I am not educated enough and a point of reference would help me greatly. Thanks!!! D