ASTM Color

Messages
324
Location
California
Hi guys, I was wondering how color is determined on ASTM scale (considering it's a scale). I know nothing about this kind of test, have no idea what does it mean and how numbers are assigned according to color. Mobil lists colors for their oils like ASTM L5.5, 5.5, 4.5, L6.0, 6.0. Why some numbers have letters and others don't? If you can post a link to a testing procedure or some kind of paper where it's explained that would be great. Or just tell us in your own words. Regards,
 
Messages
263
Location
San Diego, CA
Yeah, it's just a comparison between standardized vials/slides and a sample. Put that in front of a bright light and compare. Perhaps the "L" is just a way of saying "it's a light 6.5". ferb!
 
Messages
8,711
Location
Nothern USA
It has been years since I did anything with those color standards. There is always a way to quantify things. The numbers simply relate to the standards as the others said. Don't remember any letters.
 
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