Method for preparing make-up powder block having spot-dyeing effect and make-up powder block

A method for preparing a make-up powder block having a spot-dyeing effect, comprising the following steps:

• preparing a powder base material:
• mixing raw materials for preparing the make-up powder block to obtain a powder base material;
• preparing a spot-dyeing material:
• preparing at least one spot-dyeing base material, and mixing the spot-dyeing base material with at least one water-insoluble coloring material to obtain at least one spot-dyeing material;
• wherein the water-insoluble coloring material is selected from water-insoluble pigment powders or lakes;
• dot application:
• providing a mold, the mold having at least one cavity with an upward opening, and applying the at least one spot-dyeing material in dots onto at least one preset position on the bottom of the cavity;
• filling:
• filling the mold after dot application with a predetermined amount of the powder base material to obtain a mixed material;
• freeze demolding:
• freezing the mixed material within the mold to obtain a powder masterbatch, and then separating the powder masterbatch from the mold;
• freeze-drying:
• freeze-drying the demolded powder masterbatch to obtain a make-up powder block having a spot-dyeing effect;
• wherein the powder base material and the spot-dyeing material exhibit fluidity at normal temperature and pressure;
• wherein the powder base material and the spot-dyeing material have a viscosity of 2500 cP to 4500 cP at 25° C.