An investigation determined the feasibility of detecting and quantitating commer cially applied agents on wool by pyrolysis gas chromatography. Characteristic peaks were generated from benzoylated wool, from wool treated with the insect-resist agent Mitin FF and from wool dyed with Lissamine yellow 2G, thus demonstrating that the technique is suitable for detecting the presence of such agents. Two approaches were used for the quantitative analysis of the treatment and the dyeing using the data from the resulting pyrograms. One approach used peak area response per microgram of treated wool and the other used peaks generated from wool's tyrosine as internal standards. Although the latter approach gave a better linear fit, inverse regression analysis demonstrated that the former approach was most suitable for predicting agent add-on (percent on weight of fiber).