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Just FYI, for quite a long time now, ALS (American Lumber Standard) unit sizes have been 24” H x 48” W.That’s not to say that some mills didn’t deviate from that, particularly in lower grade, random length lumber or in earlier eras.
I am surrendering to the https://www.rslaserkits.com/3520-Assorted-Lumber-Stacks_p_3873.html
"We used color to designate length. I can still remember ; white=6', yellow=8', green=10', blue=12', black=16' loading"
I found that on Google.
Why do they paint the ends of lumber?Moisture evaporates more quickly through porous end-grain than through edge-grain. When this happens, the ends of the board shrink in width faster than the center, and the board cracks as the center resists movement. Sealing the end-grain with paint or wax equalizes board shrinkage and avoids splits. May 18, 1990https://sawmillcreek.org/showthread.php?216432-Wood-Paint-do-colors-mean-anything