These stains are for adding into clay, using as washes, adding into glazes or into decorating slips or creating underglazes.
Stains give a more predictable colour than using oxides especially at lower temperatures.
1250oC, but High Temp Red should work well up to 1300oC.
When mixing stains into clays or decorating slips they will obviously become a pastel shade.
The picture shows two fired results – at the top the stain has been put into a white decorating slip – and the bottom half of the picture is the stain in a transparent glaze.