Ketchup Red (Jayne Shatz) 6 - 6 red Gerstley Borate 31 Talc 14 Custer Feldspar 20 EPK Kaolin 5 Silica 30 100 Add: Spanish Red Iron Oxide 15 All About Iron by John Britt pg. 14 March 2011 CM Works best on dark colored stoneware. If used on a buff clay body, the red is less intense. March 2011 oxidation