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Description  

Oil Testing Kit, 5W30 and 20W50 and "unknown"; spectra smoothed and calibrated by white bike light.

about 7 years ago, warren wrote:

So was the unknown 20w50? If so, this worked pretty well as a repeatability/distinguishability test!

about 7 years ago, warren wrote:

After equalizing height, that is.

about 7 years ago, warren wrote:

Or area, actually!

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