Use only as body stain. Firing temperatures can only be a rough guide. The cycle, atmosphere, and rate of cooling will affect the colour. Zinc oxide influences the colour in a glaze more than any other element. Generally, zincless glazes should contain no magnesium oxide.
Some colours containing zinc are to be used in a zincless glaze.
The zinc in the colour is in a combined form and will not harm the colour, but free zinc oxide in the glaze can destroy the colour. Do not use zinc in glazes. Use with or without zinc. Zinc not necessary but gives better results. Best with no zinc.