Painting upholstered furniture
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https://www.thekimsixfix.com/2014/05/how-to-paint-upholstery-latex-paint-and.html
Go to Anne Sloane site she started chalk paint and is great for furniture.
Here's a tutorial I've saved for when I want to do this: https://www.pinterest.com/pin/AVsgel95FX_DawY2-lPxAn_lszE5UUxTbCuC_ZiAsUfRUAriogYyyP4/
I have not painted furniture but I have successfully dyed carpet using rit dye and vinegar. You could do the same thing if you want a darker or black or gray shade of your furniture.