Effect of dissolution on color of extrinsic porcelain colorants

The effect of in vitro dissolution in acidulated phosphate-fluoride gel on the color of metal ceramic samples having surface metal oxide colorants was determined. Three different colorants were applied using two techniques at two different firing temperatures. The color difference was most apparent when the colorant and glaze were combined with only one firing cycle. All colorants increased in value, but changes in color difference were most evident with the blue colorant. It was concluded that dissolution in acidulated phosphate-fluoride gel does affect the color of extrinsic metallic oxide colorants.