Using fertilizer in mix
Has anyone out there experimented with using fertilizer in 'tufa mix as a colorant? I have some leftover fertilizer, Ironite to be specific, it's an iron supplement. You have to sweep the fertilizer particles off of concrete as it will leave rust colored stains. Sooooo I was wondering if I could mix some of this stuff into my 'tufa to add some color, or speckles of color. I'm not sure how the fertilizer will affect the cement. Perhaps I should dissolve it in water and spray it on? Any ideas?