Before revision: With the advent of the printing press it was used in the printing ink well into the 20th century.Surmiński, Janusz, "Węglarstwo leśne – sadza i potaż" ( , Sylwan vol.
After revision: With the advent of the printing press it was used in the printing ink well into the 20th century.Surmiński, Janusz, "Węglarstwo leśne – sadza i potaż" , Sylwan vol.