: Why are the ice packs always blue I read it in the book Peter Atkins The endothermic dissolution of ammonium nitrate in water is the basis of the instant cold-packs that are included in some first-aid kits. They consist

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You wouldn't want it dyed blood red though!

But seriously, from:

Very Well Mind

we have:

Blue is a color often found in nature such as the pale blue of a daytime sky or the rich dark blue of a deep pool of water. It is for this reason perhaps that people often describe the color blue as calm and serene. Yet as a cool color, blue can sometimes seem icy, distant, or even cold.

and

Blue calls to mind feelings of calmness or serenity. It is often described as peaceful, tranquil, secure, and orderly.

and

Blue is often seen as a sign of stability and reliability. Businesses that want to project an image of security often utilize blue in their advertising and marketing efforts.

Color Psychology agrees with this view of blue.