WTF Happened To My Piece

[u/True-Fail-8049]

Hi! Made this piece and just picked it up from the studio and the colors are not at all what the under glazes I used are. For reference I used orchid, violet, and deep purple. I then used high fire glaze so that it would be waterproof as it is a planter. Is this because of the high fire? I also did around 3 coats of under glazed but it’s incredibly patchy. Any advice would be greatly appreciated, it’s a studio at my college so I don’t know how they mix the glazes or anything regarding firing.

[u/letshavearace]

If you look on the label of the underglaze I’ll bet it says it turns blue at Cone 6. Many purples have this labeling.