How do you do this? in Aesthetic Approaches and Philosophy Posted June 12, 2013 · Report reply Re: Friedl Holzer-Kjellberg's work ... can I just say WOW!!!!!!!!! I would call that mastery of form and glaze ... incredible learning curve ... not for the feint of heart. I am totally green with envy and wondering if I should make myself crazy by trying it at least once. Does anyone have a nice Cone 6 clear recipe? ... just kidding. This is a Harry Memmott cone 6 clear glaze..good with underglazes and lustres and best of all...three ingredients! Kaolin 15 Silica 35 Gerstley Borate 50 Let me know if you like it.