https://cameo.mfa.org/index.php?title=Congo_red_paper&feed=atom&action=historyCongo red paper - Revision history2024-03-29T07:15:04ZRevision history for this page on the wikiMediaWiki 1.35.3https://cameo.mfa.org/index.php?title=Congo_red_paper&diff=22869&oldid=prev at 12:01, 24 July 20132013-07-24T12:01:13Z<p></p>
<p><b>New page</b></p><div>== Description ==<br />
<br />
A acid-base indicating paper. Congo red paper is made by impregnating filter paper with a 0.1% aqueous solution of Congo red dye. Congo red is red above pH 5 and blue below pH 3. It is only sensitive to strong acids (mineral acids) and not weak acids (organic acids).<br />
<br />
== Synonyms and Related Terms ==<br />
<br />
Congo blue paper; Riegel's paper; Herzberg's paper<br />
<br />
[[Category:Materials database]]</div>