# Fehling's solution

> English word · Noun

## Definitions
1. An alkaline solution of copper sulfate which changes from blue to red in the presence of an aldehyde or a reducing sugar.

## Etymology
From Hermann von Fehling, German chemist.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/fehling-s-solution