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Why is blue applied to white clothes? Present four steps of applying blue to the clothes.

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Blue is applied to white clothes because--

It acts as a fabric whitener/brightener

Four steps of applying blue to the clothes--

1. Add blue to water and dissolve well

2. Wet the article to be blued in water and squeezed properly

3. The article is opened and then dipped in the above blue solution

4. The article is squeezed and put in the sun