Purple Mountain (Kerry) metres. Purple Mountain (Kerry) Purple Mountain () at high, is the 21st–highest peak in Ireland on the Arderin scale, and the 28th–highest according to the Vandeleur-Lynam scale. Purple mountain is the highest peak of the Purple Mountain Group, and is located in County Kerry, Ireland. Purple Mountain is composed of sandstone particles of various sizes which are collectively known as "Old Red Sandstone". Old Red Sandstone has a purple-reddish colour, and has virtually no fossils. The colour gave its name to the mountain group. The composition of "Old Red Sandstone" is variable and contains quartz stones, mudstones, siltstones, and sandstone
Metacresol purple CO dissolves as CO is acidic. In chemistry, it has two useful indicator ranges: Metacresol purple Metacresol purple or m"-cresol purple, also called m"-cresolsulfonphthalein is a triarylmethane dye and a pH indicator that is used in medicine to detect end-tidal carbon dioxide to ensure successful tracheal intubation in an emergency as the indicator inside a colorimetric carbon dioxide detector. It can be used to measure the pH in subzero temperatures of saline or hypersaline media. In colometric capnography the indicator is incorporated in a matrix that provides a pH just above the indicator's colour change, it undergoes the colour change