The present invention relates to a parts kit including a dental mill blank containing a porous zirconia material and a coloring solution for coloring the porous zirconia material. The porous zirconia material is calculated as 80% to 97% by weight of zirconium oxide calculated as ZrO2, 0 to 0.15% by weight of aluminum oxide calculated as Al2O3, and Y2O3 as the weight% with respect to the weight of the porous zirconia material. Porous zirconia material containing 0.01 wt% Fe calculated as Fe2O3, and 1 to 10 wt% yttrium oxide, and 0.01 to 0.2 wt% bismuth oxide calculated as Bi2O3. It is not included in the amount exceeding. The coloring solution comprises one or more solvents and one or more coloring agents comprising a metal ion selected from Tb, Er, Pr, Mn or combinations thereof, the solution being a weight relative to the weight of the coloring solution. %, Fe ions are not included in an amount exceeding 0.01% by weight, and this solution does not include Bi ions in an amount exceeding 0.01% by weight. The invention also relates to a process for manufacturing a dental restoration, the process comprising providing a dental mill blank comprising a porous zirconia material according to any of the preceding claims, and a porous zirconia material A step of machining an article having the shape of a dental restoration and having an outer surface and an inner surface, a step of providing a colored solution according to any of the preceding claims, and a colored solution comprising: Applying to at least a portion of the surface of the article having the shape of the object.本発明は、多孔質ジルコニア材料を含む歯科用ミルブランクと、多孔質ジルコニア材料を着色するための着色溶液と、を含むパーツキットに関する。多孔質ジルコニア材料は、多孔質ジルコニア材料の重量に対する重量％として、ＺｒＯ２として計算される酸化ジルコニウム８０～９７重量％と、Ａｌ２Ｏ３として計算される酸化アルミニウム０～０．１５重量％と、Ｙ２Ｏ３として計算される酸化イットリウム１～１０重量％と、Ｂｉ２Ｏ３として計算される酸化ビスマス０．０１～０．２重量％とを含み、多孔質ジルコニア材料は、Ｆｅ２Ｏ３として計算されるＦｅを０．０１重量％を上回る量では含まない。着色溶液は、一又は複数の溶媒と、Ｔｂ、Ｅｒ、Ｐｒ、Ｍｎ又はこれらの組合せから選択される金属イオンを含む一又は複数の着色剤とを含み、この溶液は、着色溶液の重量に対する重量％として、Ｆｅイオンを０．０１重量％を上回る量では含まず、この溶液は、Ｂｉイオンを０．０１重量
