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A decal isn't fired that much differently than any other piece of ware, although there are some special considerations. Venting is very important to good results with decals - especially to get true colours.
Problems related to venting include: poor colour development, a cloudy or hazy appearance. Proper heatwork is also an important factor. Decals that are under or overfired may exibit the following: faded colours (overfired), colour shift (underfired), decals rub off (underfired), dull appearing metallics (underfired)