Hi All, I have a recipe for a glaze that calls for R 10. I made the glaze and love it on a certain clay and I showed the piece to a friend. He wanted the recipe so I gave it to him and he asked me what is R 10 and I don't know. Here is the recipe: Randy's Red Cone 5-6
Flint 30% EPK 5% G 200 20% Talc 15% Gertsley Borate 30% R 10 15%
The R 10 looks a lot like red iron oxide. I bought it at my local clay supply store. Does anyone know if red iron ox. could be substuted for R 10? Does anyone know what R 10 is?
Thank you for any info on this. Sandi