391 Brightness Price: $312.00


Participants receive two similar samples for these paired tests. Each sample consists of eight pre-conditioned 4 1/4" x 5 1/2" sheets of fluorescently brightened papers. Measurements are made following TAPPI Method T452. 
 
Labs measure directional brightness in Test 391 and then calculate the fluorescent component of those same samples for Test 394 according to appendix C of the method.
 
Laboratories must use an instrument with fluorescence separation capability and be able to calibrate the instrument with a fluorescent paper standard. 
 
Enroll at any time; your subscription will start with the next scheduled shipping date and will include six (6) shipments.
 
Testing conducted during February, April, June, August, October and December.