OBAs are chemical compounds that play with colors. As the name suggests it is self-explanatory that Optical Brighteners are those brighteners operate the visible part of the electromagnetic spectrum, especially in relation to the action of light and colors.
Optical Brighteners are those chemical compounds which when applied on any substance absorbs the high frequency lights (colors) such as Brown, Yellow and reflects the low frequency lights (colors) such as violet, indigo and Blue. OBAs use the invisible ultraviolet rays to reflect the Bluish Color
So here we come to know with all the above-mentioned points it is understandable that OBA are utmost important compound for any substance. If any object that is not all pleasing to eyes and presentable in appearance, how much ever the useful the object is, it loses the value. Thanks to optical brightening agents for making our world so bright and beautiful.