The phenomenon where a substance changes color in response to salt or halogen content.
From 'halo-' (salt) + 'chromy' (from Greek 'chroma' meaning color). Related to halochromism; both emerged from early 20th-century analytical chemistry.
Halochromy is essentially nature's salt detector—some organic compounds are so reactive to chloride ions that they shift colors, which chemists exploit to create indicators that show salinity levels without any instruments.
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