not telling you anything and not telling you what you want to know are two different things. Wilhelm's methods are extremely valuable, even if they don't tell you how long *your* prints will last.
Herb... ----- Original Message ----- From: "William Robb" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, February 11, 2004 7:36 PM Subject: The Wilhelm testing method. Was Re: OT: Photographic Materials > The problem with any extrapolated test, be it Wilhelm's > method, which is decidedly harsh, or Kodak's, which is not > really a longevity test at all, is that neither one really > tells you anything. > > Wilhelms method tells you tat if you pump 450 lux into a > print for 12 hours per day, it will start to fade after X > number of days. > Nothing else. > Nada. > His methods don't reflect how prints are treated in the > real world, and cannot be used to judge anything, beyond > comparing how different materials react to his testing > procedures.
