If I had only one hour to save the world, I would spend fifty-five minutes defining the problem, and only five minutes finding the solution.
—Albert Einstein (attributed)
I worked in the mailing industry for several years. At one point, we began investing in innovation to create black fluorescent ink. Fluorescence in the traditional red postage mark on a mail piece is used by mail processing equipment to orient the mail so that its address can be read. The evolution toward postmarks with intelligence in the postal barcode demanded that the image be readable, as well. Readability requires contrast, which red ink did not provide, especially on some envelope types.
Step 2: Proceed directly to article: https://www.tandfonline.com/doi/full/10.1080/08956308.2019.1563433