The Kodak 4x4" #106 Amber Special Dye Wratten 2 Optical Gel Filter converts an S-4 type photocell response (such as found in a densitometer) to the even-luminosity response of the human eye.
Wratten 2 Improvements
More rigid/durable
Easier to handle
Color consistent today, and 6 months from now as well
Wratten 2 Optical Filters are less sensitive to humidity, less prone to static cling
Fingerprint removal is also easier
UPC: 041771314569