Until early 1961 its members showed works in oils or pigments mixed with plaster and sand , usually on panels , linen or jute .
The Dutch Informal Group , preceding the formation of the Nul group , was founded in 1958 .
Until early 1961 Dutch Informal Group 's members showed works in oils or pigments mixed with plaster and sand , usually on panels , linen or jute .
The Dutch Informal Group , preceding the formation of the Nul group , was founded in 1958 .