Gas kiln firing, 2020/03/16. Chosen Karatsu and Madara glazes. 3 types of Madara glaze from old buckets in which the exact contents were largely forgotten.
The normal madara glaze ended up being too low in silica, and going clear in most cases. Shirakawa madara pinholed in most cases. I’d forgotten about this behaviour. New Madara glaze test shows good color, but also, low in silica perhaps, needs more straw ash added (1kg).
Shida madara much too clear, only showed white where very thick. Maybe miscalculated when mixing the glaze? Add more Shida (2kg?) to overall batch. Test again.
Opening the kiln 
Good katakuchi @cone11 flat, but pinholing with the Shirakawa Madara glaze. 
Soft cone 11 on the bottom. Good. Madara glaze too thin, or not enough silica, or both. 
Yes, probably not enough silica 
a damn shame. hammer? 
Left:Shirakawa Right:Normal 
NormalMad to melty, need more silica. 
ShirakawaMad pinholing even at the bottom cool part of the kiln. 
Lovely reduced cups. BinchoTan, shells 
Super. Nice refire color in heavy reduction plus cooldown reduction. 
Yessssss… 
sample tiles @cone11 flat (cone 12 equivalent?)