Would someone mind sharing the exact commands they are using to do the spot read so I can make sure I'm doing it the same as everyone else. I've got a couple of different brands of tape I'll measure. Thanks On Sat, Mar 13, 2010 at 5:12 AM, Martin Weberg <martin.weberg@xxxxxxxxx>wrote: > I dug out some old thread seal tape I knew was laying around. It's at > least a decade old. Only about 4mm thick layer of PTFE left and a blue > core/roll. Measured it using my Spectrolino, spotread -Fn. > > Three readings: > Just touching the PTFE > Pushing the spectro onto the PTFE > Measurement of the reference tile > > Lab values: > 99.77639 -0.368822 -0.919332 > 99.614116 -0.738062 -1.796401 > 95.862586 -0.691355 1.124242 > > Plots are attached. > > Seems like the blue core "shines through" when pushing onto the PTFE. > I don't now the thickness of PTFE on a fresh roll but I guess it's at > least the double (~8-10mm). That would help I think together with a > white core. I'll grab a fresh white roll when I get the opportunity. > > Martin Weberg > -- Hay que aprender algo nuevo todos los días