Goldwell Silk Lift Conditioning Serum Concentrate. Intensive care serum concentrate – is used in conjunction with the Silk Lift High Performance Lightener (blonded). For optimal structural balance + care during bleaching. Extra care for damaged hair – with SilkproteinComplex and IntraLipid. Optimal handling and dosage. Application: To upgrade the premium service, add the serum (2 – 3 pumps) before the customer for bleaching.