What a glaze! and a mystery

I've always thought of ohata kaki as one of my favorite glazes. It's a Japanese glaze and name; some part of it means persimmon. It's usually brown, though, in my experience, with a warm orange undertone. Like this:

It's a lovely glaze to work with too; it covers evenly, it doesn't run, and it is spectacularly easy to clean. Everything washes easily off this casserole dish.


Recently, and mysteriously to all involved, pots have been coming out like this

at the shared studio where I take classes. Warm, glossy, orange with depth and a brown undertone. Hmmmm. Any explanations? Pottery is one of those big fields, where there's no end to things to learn and ways to improve and discover. Wonderful.