OK I am assuming I screwed up although I still wonder how that could happen as careful as I am. I made the recipe listed below first as a 400 gram test batch that came out perfect with just the right surface, fit and break that we were looking for.
The base is transparent and we wanted to take the color down a couple of shades so I made a 10,000 batch and split out 4 small (100 gram equivalent) test batches from that and adjusted the additives a point a shot for two of them and then did a couple with two different mason stains as additives. The goal was to create a small half dozen color palate using this transparent base for a line of hand painted pieces that needs a surface that allows detail to show through but have a color tint instead of just a clear coat on top.
I was expecting issues with possible clouding with the stains or a trend toward opaque. I did not expect the glaze to go from a high gloss to completely matt. One possibility because my scale tops out before the weighs I need for 10k grams I have to break each measurement in half so it is possible, maybe, I put 30% of one and 10% of something else. This is the only possible mistake I can see and since I am so careful It would surprise me if that's the case.
Can anyone see something else in the recipe that might cause this or have a suggestion of an adjustment that might get me back to gloss? I did use a new bag of frit 3134 but all the other ingredients were on hand and the ball clay was OM4.
* All test were fired in the same 1cf test kiln with a controller fired ramp to cone 5 with 15 minute hold and controlled cool down to 1200 degress.
Honey Amber ^6 Oxidation Glaze
Frit 3134 20
Ball Clay 20
Manganese Dioxide 3
Red Iron Oxide 5