11. Less commonly used dyes include Cresol Red and Orange G which migrate ahead of bromophenol blue. 12. The name cresol reflects their structure, being phenols, and their traditional source, creosote. 13. These residue contains a few percent by weight of xylenols as well as cresols and phenol. 14. Commonly used color markers include Bromophenol blue, Cresol Red, Orange G and Xylene cyanol. 15. Breathing high levels of cresols for a short time results in irritation of the nose and throat. 16. This expansion increased production capacity for the intermediate cresol for the global market by some 20 percent. 17. Short-term and long-term studies with animals have shown similar effects from exposure to cresols . 18. Chemical analysis has shown that the secretions are composed of p-cresol , guaiacol, and vanillin. 19. "p "-Cresol is produced by bacterial fermentation of protein in the human large intestine. 20. Cresols have an odor characteristic to that of other simple phenols, reminiscent to some of a " coal tar " smell.
