The use of methanesulfonic acid offers a novel and highly efficient method for the synthesis of phthalein indicator dyes in excellent yields on an industrial scale.
Sabnis, Ram W.
experimental part
p. 6261 - 6263
(2010/01/11)
Oral care compositions with color changing indicator
The invention describes color changing toothpastes and mouthwashes which contains acid-base indicator(s) for interaction with the oral cavity to provide a color change indicative of treatment time.
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Page/Page column 25
(2008/06/13)
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