Why is Owens Corning insulation pink?

Owens Corning insulation is pink purely because of branding and trademark, not because of any technical requirement. When fiberglass insulation was first developed, it was naturally tan or yellowish. In 1956, Owens Corning added a red dye to its fiberglass to distinguish its product from competitors and to give it a more recognizable, clean appearance. The bright pink color was chosen because it was distinctive on job sites and in stores. The color became so iconic that Owens Corning trademarked the color pink for fiberglass building insulation in 1985, becoming the first company in the United States to trademark a single color. This is why other fiberglass manufacturers use different colors. Johns Manville uses white and yellow, CertainTeed uses yellow, Knauf uses green with its ECOSE binder, and Guardian uses a lighter pinkish tan. The pink dye has no effect on R-value, fire resistance, or performance. It is just a colorant added to the binder. Owens Corning leaned into the branding so heavily that it licensed the Pink Panther cartoon character since 1980, and for decades has run Breast Cancer Awareness campaigns donating to fight breast cancer because of the pink color connection. So if you see pink insulation, you know it is Owens Corning, just like you know Tiffany boxes are blue.