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To preserve the mechanical property of color-treated zirconia for optimal restoration longevity, aqueous colorants have been developed as an alternative to acid-based coloring agents. However, little is known regarding the effects of aqueous colorants on the color of zirconia.<br />The purpose of this service was to compare the effect of aqueous coloring liquids with acid-based coloring liquids on the color of zirconia. The experiment was carried out by spectrophotometry.