Person holding litmus paper during ph acid test-9933
Rate this image
![](https://stockarch.com/files/imagecache/Preview/20/04/alkali_chemistry.jpg)
Image Description:
A close up of a person holding litmus paper during a ph acid test.
Keywords:
acidity, change, chemist, chemistry, colour, experiment, green, laboratory, litmus, paper, ph, strip, test, dipped, science License:
![Creative Commons License](http://i.creativecommons.org/l/by/3.0/80x15.png)
or accept license and edit with pixlr