Special fatliquor for soft and light weight skins The leather chemical Synthol YY 707 is a special fatliquor for soft and light weight skins. Characteristics Synthol YY 707 is a special fatliquor blend and gives an exceptional deep inner softness for light weight skins. This leather chemical reacts with the fibers instead of merely depositing between them. With Synthol YY 707 together with Sulphirol EG 60 and Synthol NE we reach a dark and clear black. Synthol YY 707 has no affinity to the hair. TDS request Request a TDS of product TDS Sample request Request a sample of product Request