Themes: Advertising and Promotion
Period : 1983-2003
Organization : Jyothi Laboratories
Pub Date : 2003
Countries : India
Industry : FMCG
Fabric whiteners, which are classified as 'laundry aids,' complement the use of detergents by making clothes whiter. Fabric whiteners can be further classified as bleaches and blues. Bleaches whiten and brighten fabrics and help remove stubborn stains by converting the dirt into colorless, soluble particles that can be easily removed by detergents. A variety of different bleaches, with different chemical compositions, are available in the market (Refer Table I).
TABLE I
DIFFERENT TYPES OF BLEACHES
Type of bleach |
Use |
Best as… |
Chlorine (Liquid or Gel) |
Removes stains, whitens and brightens; repeated use weakens fabrics |
Disinfectant, whitener |
Hydrogen Peroxide |
Removes stains, whitens |
Milder solution able to whiten fabrics |
Oxygen |
Removes stains; |
Safe for most colored fabrics |
Color removers |
Reduce or completely removes colored dyes from apparel |
Removing rust or dye stains from white apparel |
Source: Kansas State University Agricultural Experiment Station and Cooperative Extension Service.
Blues, or optical brighteners, contain a blue dye or pigment or a solution of fine blue powder. During the washing process, the fabric picks up the blue color, which makes it
'appear' whiter. Optical brighteners work on the principle that 'white with a little blue tint appears to be brighter4' (if two similar white fabrics are kept under a spectrograph, the one with a blue tint would appear brighter).
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4] The human eye sees objects because of the light reflected by them. When light falls on an object, it absorbs the full spectrum of the light and throws back only a part of it. The color of an object is perceived according to the part of the spectrum reflected by it. The blue tint on white fabrics absorbs the yellow part of the spectrum, thereby making the yellowish tint invisible. This makes the cloth look whiter.