Paint It (Matt) Black Posted by Toby Van de Velde on September 22, 2017. So I have slapped the glaze on Ceramic Pinhole Mk I, and as promised, the interior is a nice matt black. I have done the exterior matt white so that I can decorate it with cyanotype work. It’s in the lap of the kiln gods now – at 1260 degrees C. Facebook Twitter Pinterest Reddit LinkedIn WhatsApp