Shirt Interfacings Can Turn Yellow
Article compliments of Fabricare Magazine:
The Problem- Some washable white dress shirts and blouses can get a yellowish tint in local areas after acceptable laundering procedures. The yellow looking places are the interfaced areas, such as the collars, cuffs or the front button hole placket
It Looks Like- The shirt now has a two-toned appearance in some places. The interfaced panels have yellowed while the rest of the shirt remains white.
The Cause- Interfacings are used on the inside under the base fabric in some areas to impart added stability, shape, and body. Many times these shirt facings are treated with resin type finish to help with stiffness and keep the facings “wrinkle-free.” Some of these finishes are “bleach retentive”, thus absorb and hold bleach when it is used in normal home washing or used in a regular white-work commercial laundering formula. If washing alkalinity and bleach cannot be completely neutralized or flushed from the fabric during rinsing operations then a yellow discoloration is likely to occur during the heat of drying or pressing.
Prevention- Most laundries will wash white shirts and blouses in a “white work” formula that contains oxidizing bleach for whitening as well as for sanitation and stain removal. Therefore, the best method of preventing the yellowing is for the shirt manufacturer to use an interfacing which is compatible to all expected home or commercial wash formulas that are standard for white cotton and cotton blends.