A type of dyes which absorbs light in the ultraviolet and violet region of the electromagnetic spectrum and re emits light in the blue region is known as optical brighteners. These are often used to enhance the appearance of color of fabric and paper which causes whitening effect making material look less yellow which increases the overall amount of blue light which is reflected. Basic types of brighteners include diazoles, triazoles and also these brighteners can be boosted by adding certain polyols like molecular weight glycol or alcohol. The very common uses of these brighteners are used in the laundry detergents which replace the whitening agents which are removed during washing by making clothes cleaner. These optical brighteners have also replaced bluing which was formerly used for producing the same effect.
These brighteners are used in many papers which are of high brightness which results in their strong fluorescent appearance under uv illumination and also are used in cosmetics as it is highly recommended for blonde hair where these brighteners can only increase the luminance and the sparkle of the hair. In simple language these optical brighteners can be elaborated in a simple manner as these optical brighteners are whitening agents which are highly used in plastics, fibers, coatings, dyes, inks etc. Long time back bluing agent was highly used for laundry but since with this invention today these brighteners are used so that clothes when are washed thus appear to be more cleaner.
Unique optical brighteners are liquid optical brighteners which are highly recommended for cotton that is it is used for cellulose fiber which have a bluish tone and are also low in dosages and are much of cost effective. The advantages of these optical brighteners are it does not cause yellowing by giving excellent brightness to cellulose. It is also known for providing fluorescent brightness to pulp and also is effective in lower concentration. These optical brighteners are highly used for the industrial purpose and few of them are also used for coloring pvc pipes and other plastic and are also available at reasonable price which are also suitable for different application and various temperature conditions.