Short But Big Prom Dresses

MA. Davidoffskiego. 1. Dolls with black spots. Mgr

In the 80s, a woman was making porcelain dolls. Complaining But one thing terribly. When I painted the head of each doll and the finger touches the surface, each time by pulling the doll out of the oven ready to face the toy could see black spots. Such a defect immediately eligible to throw the doll.

question is: how took the black spots on the heads of dolls? solution today, after 22;)

In the 80s, a woman was making porcelain dolls. Complained, however, one thing terribly. When she painted heads of the dolls with touching them with her fingers, each time black speckles appeared on every doll. Such a defect made all the dolls' heads to be thrown away. 
The question is : why black speckles appeared on the heads of dolls ?

The solution today, after 10 pm;)