The application of a treating solution containing polyhydroxy compound and choline chloride to a fibrous cellulosic material is made more uniform and reproducible by including in the treating solution a colorizing amount of a fugitive tint, by which the uniformity of the application can be observed and corrected by appropriate changes to the operating variables.

La demande d'une solution de traitement contenant le polyhydroxy chlorure de composé et de choline à un matériel cellulosique fibreux est faite plus d'uniforme et reproductible en incluant dans la solution de traitement par quantité colorizing d'une teinte de fugitif, par laquelle l'uniformité de l'application peut être observée et corrigée par les changements appropriés aux variables de fonctionnement.

 
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