Technique of oil painting and preservation of paintings

[Seriy]

Under American law at each toxic pigment should be a warning. Cadmium appeared only in the late 19 th - early 20 th. Matisse was the first who began their extensive use (red fish).
English in the network has complete information with lists of pigments for toxicity.
Nata, in the 19 th century gave the recommendation of the housewife-How to get rid of the wooden house of roaches? - In a hot oven put a jar of liquid mercury, leave the house. When it cools, more cockroaches in the house will not live.