期刊名称：WAAC Newsletter / Western Association for Art Conservation
电子版ISSN：1052-0066
出版年度：2012
卷号：34
期号：2
出版社：Western Association for Art Conservation (WAAC)
摘要：It is never fun to admit one was wrong. Particularly when one is the "expert," and one has been wrong for quite a long while about something. To see just how lon g I was wrong, I refer you to th e WAAC Newsletter of May 1989. In that ar- ticle, with some p rescience, I said "You must check the pH yourself with pH papers or a meter; trust no one." Trust no one, including, it would seem, me. It turns out that pH meters do no t accurately measure the pH of a Pemulen or Carbopol gel, even when thinned exten- sively with distilled water. Richard Wolbers suspects that th e polymer (Pemulen or Carb opol) interferes with the ref- erence electrode incorporated into the pH meter.
