Mrs. Stewart's Bluing (MSB) is a brand

Brand

The American Marketing Association defines a brand as a "Name, term, design, symbol, or any other feature that identifies one seller's good or service as distinct from those of other sellers."...

 of fabric bluing

Bluing (fabric)

Bluing, laundry 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 to the fabric.- Uses :White fabrics acquire a slight color cast after use , because they can never be cleaned...

 agent which whitens fabrics with a dye

Dye

A dye is a colored substance that has an affinity to the substrate to which it is being applied. The dye is generally applied in an aqueous solution, and requires a mordant to improve the fastness of the dye on the fiber....

 called Prussian blue

Prussian blue

Prussian blue is a dark blue pigment with the idealized formula Fe718. Another name for the color Prussian blue is Berlin blue or, in painting, Parisian blue. Turnbull's blue is the same substance but is made from different reagents....

 (ferric hexacyanoferrate).

Mrs. Stewart's was founded by Al Stewart, a traveling salesman

Vendor (supply chain)

A vendor, or a supplier, is a supply chain management term meaning anyone who provides goods or services to a company. A vendor often manufactures inventoriable items, and sells those items to a customer.- History :...

 who sold the formula to Luther Ford of Minneapolis, Minnesota

Minneapolis, Minnesota

Minneapolis , nicknamed "City of Lakes" and the "Mill City," is the county seat of Hennepin County, the largest city in the U.S. state of Minnesota, and the 48th largest in the United States...

, who owned what has been claimed as the second five and dime

Five and Dime

Five and Dime is a cartoon short by Walter Lantz which features Oswald the Lucky Rabbit. It is the 74th Oswald short produced by Lantz and the 125th overall. It also is among the number of shorts that feature Oswald in his fully clothed appearance....

 store west of Wanseburge, Pennsylvania. Mrs. Stewart's Bluing was first sold at Ford's store in 1883. The product was first manufactured in Minnesota.

The picture on the label is a portrait of Al Stewart's mother-in-law, hence her name was "Mrs. Stewart."

In 1976 the company moved from Minneapolis to Bloomington

Bloomington, Minnesota

Bloomington is the fifth largest city in the U.S. state of Minnesota in Hennepin County. Located on the north bank of the Minnesota River above its confluence with the Mississippi River, Bloomington lies at the heart of the southern...

, a nearby suburb.