Especially because once you have a can (or tub) of PA with a unaltered label, you can keep refilling it with fresh PA
But the advent of lithography in the 1870s made it possible to mass-produce them in color, leading to a golden age from 1876 to the early 1900s when halftone printed newspaper and magazine ads became more economical
Formaldehyde, acetaldehyde, acrolein (carbonyls) Role: Irritation, inflammation, DNA-protein crosslinks
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