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The metals for porcelain fusing used in this study were gold alloys and nickel-chromium alloys. Chromatic characteristics were compared between samples of 0.1, 0.2 and 0.3 mm thickness. The dentin porcelain was fused on the opaque surface. Chromatic analyses were then carried out at each stage of 0.1 mm-incremental reductions of the dentin thickness starting from 0.5 mm. In conclusion, the metallic color was not sufficiently hidden by opaque porcelain 0.1 mm thick for both the gold alloy and nickel-chromium alloy samples. The metallic color was sufficiently hidden by opaque porcelain of 0.2 mm thick for the gold alloy sample but was not sufficiently for the nickel-chromium alloy sample.