Colour fastness to perspiration is determined by the Justy perspirometer against known international standards. Metallic frame with 5kg loading device. Acrylic resin separator plates supplied. Recommended two units one for acidic tests and the other for alkaline tests. The procedure normally involves, treatment of samples in contact with specified fabrics and placing them between the plates of the PERSPIROMETER. The unit is then incubated for the specified number of hours at body temperature. After drying, the change in colour of each sample and the staining of the fabrics are assessed with Grey Scales. A Hot Air Oven is required.