New in this edition

This 4th Edition of 'Patch Testing' has several new features and improvements as compared to the previous 2008 3rd Edition:

  • 550 new chemicals / compounds with information on patch testing have been added (now totalling 4900)
  • 275 new references have been added (now totalling nearly 1000), mostly from the period 2008- 2018
  • the book has gained 125 pages from expanded information, notably the 550 new entries, the addition of CAS numbers and recent references
  • CAS numbers (Chemical Abstracts Service, are now provided for each chemical / compound, when available and identifiable
  • in the previous Edition, INCI names (International Nomenclature Cosmetic Ingredients) were already provided, but often as synonyms; in this Edition, (virtually) all chemicals present in the INCI system (cosmetic ingredients only) now have their INCI names as main entries (preferred names)
  • prefixes (cis-, dl-, tert-, p-, bis- etc.) and figures (2,4-, 1,3,5- etc.) were positioned thus far after the name of the chemical, which had been done to facilitate alphabetizing (in 1985, a very early Dbase program was used to create Table 1); in this Edition, they have returned to their proper positions
  • prefixes are now italicized according to chemistry convention (e.g., cis-, dl-, tert-, p-, o-, m-, d-, l-, trans, N-, (R)-, (S )-)
  • for chemicals that all three commercial suppliers of patch test materials have in their product range and in the same concentration, no other (previously) suggested test concentrations are shown anymore
  • incorrectly spelled names have been corrected (mistakes and imperfections came to light when looking for CAS numbers)
  • chemicals that could not be found in any of the chemical databases or elsewhere on the internet, probably indicating that their names were either incorrect or that they are non- existent, are now labelled as 'unknown chemical'
  • information on identical chemicals that was previously sometimes shown under different names (unrecognized synonyms) is now provided under one main entry