Silver is a wildcard, and there are a lot of variables. I’m interested in this as well and can run a test or two next week to see if I can narrow things down.
I’ve pretty much ruled out the difference in production dates with a test I ran back in 2012 (?) using 8 different runs of French Vanilla that spanned 2010 – 2012.
We’ll try a few different firing schedules with holds at different temps on the way up to see how that factors in.
The cycle I used in this tile was a variation on a “basic” full fuse, 300°F/hour to 1225, hold :45, then 600°F/hour to 1490 :10. I suspect that airflow within a certain temperature range (guessing 1000 to 1250°F) matters, though I haven’t done a side by side of peep hole plugs in vs. out. Typically firing with them in, we do experience variation in the results. Firing slower, changing the rate, not just the holds is something else I’d like to see. My hope is to narrow things down to try for “maximum fuming”, but even still I don’t expect to have fully uniform results. We’ll see!
If Michele could post a photo to illustrate the variation she’s seeing in her own work, (in the same firing) that would be great!
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