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Apologies if this topic has been raised many times before. Just wondering if there is such a thing out there as a substitution chart for UK/European potters who encounter American brands of frit. I have found this one at ceramics today, which is helpful for Silica/Alumina Ratio, Molecular Formula and Percentage Analysis, but it would be ideal if there was one that specified particular UK brands such as Potclays, Potterycrafts etc as an alternative to the Ferro frits. Can anyone lend any advice on this? I am excitedly reading through John Britt's Mid-Range Glazes book but a little dismayed that almost all the recipes contain US frits!
I'm using mason stain for the first time to create a black slip. Currently I'm at 5% with 6600 black Mason stain, and my casting body is barely gray after testing. I'm doubtful that another 5% will do the trick. A friend recently suggested that Ferro stains have a higher saturation, that they seem to be more concentrated, and that a person generally has to use less for the desired result. Does anyone know if there's any truth to this? And what stains do you prefer and why?