Pickering Laboratories – Dye Analysis Standards

Inspired by the ASTM D4265-98 method for staining, Eccrine Perspiration is emulsified with Artificial Sebum. This emulsion mimics non-exercise induced skin surface film liquids (SSFL). As SSFL, it can be used to test any topical use product or the stability of any article that will come in contact with human sweat.

COLORFASTNESS OF ARTICLES FOR COMMON USE

This solution is used to determine the colorfastness of articles for common use to perspiration. This test establishes whether coloring materials can migrate from the articles of daily use to the skin. The test method is applicable to all articles of daily use, independent of the coloring procedure applied (dyeing, staining and coating). The formulation is offered at pH 6.5. (Custom pH and stabilized versions available).

COLORFASTNESS OF FABRIC TO PERSPIRATION OR TO A COMBINATION OF LIGHT AND PERSPIRATION

This pH 4.3 solution is used to determine the colorfastness of textiles to the effects of acid perspiration according to Test Method 15. The same formulation is also used to determine colorfastness to a combination of light and perspiration according to Test Method 125. It is applicable to dyed, printed or otherwise colored textile fibers, yarns and fabrics of all kinds. This formulation can also be used for the testing of dyestuffs as applied to textiles. (Custom pH and stabilized versions available).

COLORFASTNESS OF TEXTILES TO EITHER A COMBINATION OF LIGHT AND PERSPIRATION OR JUST PERSPIRATION

These test solutions are for all kinds of textiles and textiles in all forms. Textiles are wetted with either the acidic or alkaline solution to test the combined effect of perspiration solution and exposure to light according to ISO 105-B07, and to perspiration only according to ISO 105-E04. The pH of the acidic solution is 5.5 and that of the alkaline solution is 8.0. (Custom pH and stabilized versions available).

COLORFASTNESS TO PERSPIRATION FOR LEATHER

This formulation is used to determine the color fastness to perspiration of all kinds of leather at all stages of processing, but it applies particularly to gloving, clothing and lining leathers, as well as leather for the uppers of unlined shoes. This alkaline perspiration has a considerably greater effect on the color of leather and is therefore used to stimulate the most demanding conditions. The solution is offered at pH 8.0. (Custom pH and stabilized versions available).

FOR TESTING OF PRODUCTS FOR CORROSION, COLORFASTNESS AND DISCOLORATION

This ready-to-use solution closely resembles the mineral composition of natural saliva and can be used for testing a wide variety of products, including dental metal alloys. This formulation is at pH 4.9 and should be stored refrigerated.

TO DETERMINE COLORFASTNESS OF PRODUCTS INTENDED TO BE TAKEN INTO THE MOUTH

Artificial Saliva is prepared according to DIN 531601:2010-10 standard procedure. DIN 53160 specifies the method to determine colorfastness of products intended to be taken into the mouth. The formulation consists of two parts that are mixed right before use. This minimizes changes in the solution during storage and allows for a longer shelf life. The solution should be stored frozen both before and after mixing. The pH of the solution after mixing is 6.8.