Product Details Dixon Brand China Marker are recommended for marking on tiles, bricks, ceramics, crucibles, glass and metals. Remain legible when heated up to 1300C. Note this is not a underglaze pencil. For underglaze pencils click on the following link https://ruffshufflerceramics.co.nz/product-category/clays-glazes-tools/glazes/underglazes/underglaze-pencils-chalks/
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