Here’s the gem from that article. It had never occurred to me to look deeply into the magical meaning of colors. I only looked at sources!

“Black is also the colour associated with the alluvial silt deposited on the banks of the River Nile after the annual flood receded. Since this fresh and fertile soil provided the ideal environment in which seeds for crops could germinate and grow, it was viewed it as being inherently magical and regenerative. Clay and wooden seed beds in the shape of Osiris, filled with black soil from the Nile and sown with germinating seeds, were sometimes included with the funerary equipment in New Kingdom burials. ”

Anthony

You can lead a horse to water but you can't make him think.