Abstract
Viscose and PVA films are dyed by such dyes as Direct Violet 2R, Japanol Violet J, Chrome Violet BC and Neolan Violet 3R, and also PVA Films are colored by some acid dyes as Orange II and Azo Eosine.
Changes in absorption spectra of these films by dry heating are studied and the following results are obtained:
a) No deformation of the absorption curves is observed by dry heating in the cases of dyed viscose films.
b) By the dyeing of PVA films the new absorption is developed to red side of the maximum wave length. The new absorption (shoulder) is decreased by dry heating in the case of Direct Violet 2R, and color change is observed, but in the cases of other dyes it is not observed.
