Studies in Wool Yellowing

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Abstract
Variations in the concentrations of aluminum sulfate and sodium formaldehyde sulfoxylate, added with the fluorescent brightening agent to unbleached wool, can affect both the extent of bleaching and the uptake of fluorescent brightening agent. Experi ments with different fluorescent brighteners have confirmed that several of these reagents are suitable for wool fabric if the fabric is subsequently treated with thiourea-formaldehyde. Comparisons made were based primarily on changes in fluorescence and yellowness index on irradiation. Resins may be added with the thiourea-formaldehyde treatment to increase the resistance of the fabric to shrinkage without adversely affecting the protection given against yellowing. Fabrics treated initially with hydrogen peroxide instead of chlorine showed improved shrink-resistance when followed by resin-thiourea-formaldehyde treat ment and appreciably better appearance.

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