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Field Notes

Material studies, product development notes, and science-forward essays from The Calculated Chemist.

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A Color-Changing Halloween Mocktail, Explained by Chemistry

Featured Note · Oct 26, 2026

A Color-Changing Halloween Mocktail, Explained by Chemistry

Butterfly pea tea, lemon juice, and a visible change in pH: a restrained Halloween drink with real chemistry behind the color.

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Do You Need Electrolytes? A Chemist’s Look at the Hydration Aisle

Oct 26, 2026 · Everyday Chemistry

Do You Need Electrolytes? A Chemist’s Look at the Hydration Aisle

Sodium, potassium, concentration, and context: how to read electrolyte drink claims without assuming every bottle of water needs a supple...

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