Axner Black Underglaze Pen
†Underglaze Pens were developed for cone 05 and 06 firings, however most of the colors do quite well at much higher temperatures. Our own testing has yielded the following results:
•Cone 06 - 04: All colors remain strong and vibrant
•Cone 6: Most colors remain strong and vibrant. Exceptions: Chartreuse, Light Yellow, Pink, Lilac, and Light Pink are weak. Greens, Peach Sun, and Purple Maroon change color somewhat.
•Cone 10: Same as cone 6 with the following exceptions: Chartreuse, Lilac, Pink, Peach, and Light Pink completely disappear