Reckitt's Blue Laundry Blueing. A pack of 10 small, solid squares of ultramarine blue, packaged in authentic Reckitt's packaging. Reckitt's Blue can still be found in some parts of the country on "ghost ads," old signs on the sides of supermarkets, etc., and has been unavailable in the United States for many years. Originally, this product was used as a whitener for cotton, but over the years it has been used for many other purposes, and the color is striking! (Information on the Reckitt's Blue packaging) "Wrap Blue in a cloth. Stir while squeezing the blue laundry in the final rinse water. Immerse the items briefly, keeping them agitated." The tablet may fall out of the packaging, so handle with care. The tablet is quite small; it doesn't need to be large, as it can be reused for several washes. As you can see in the photo, the paper this product is packaged in is very old-fashioned and would look great in any laundry room.