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What are the ingredients of seal clay made of?

Imprinting clay is an oil-soluble seal coloring material formulated from pigments, oils and preservatives and other ingredients.

Modern process of preparation of sealing clay. The main components of the red seal mud is lead chromate, mercury sulfide, big red powder 88, barite powder, white Yanhua, castor oil or chlorinated paraffin oil, phenol, ai wool and cottonwood. Blue printing clay is mainly composed of oil-soluble aniline blue and oleic acid, castor oil and so on.