&sq=Google&lang=en&file=File:Question_book-new.svg){kind=small} | This article needs additional citations for verification. (August 2012) |
Bluing, laundry blue, dolly blue or washing blue is a household product used to improve the appearance of textiles, especially white fabrics. Used during laundering, it adds a trace of blue dye (often synthetic ultramarine, sometimes Prussian blue) to the fabric.