![](http://www.alamy.com/thumbs/6/5F6CF082-79FE-4868-8895-94B62EB2A202/DBD12P.jpg)
A small bottle of universal indicator with pH chart on a desk in a laboratory, as used in a UK high school.
A Universal indicator is a pH indicator composed of a solution of several compounds that exhibits several smooth colour changes over a pH value range from 1-14 to indicate the acidity or alkalinity of solutions.
Size: 2400px × 3624px
Location: London UK
Photo credit: © Maurice Savage / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: acidity, alkalinity, bottle, chart, close, detail, education, flammable, high, indicator, material, ph, practicals, range, school, science, ui, uk, universal