This chart outlines various nutrient stress conditions many plants face. the direct symptoms are also shown as a condition of leaf damage. The symptoms can often help identify which nutrient is causing the stress. nutrient stress can be caused by both too little or too much of micro or macronutrients.
Any color but pale or teal are shades I like and would use. Basically anything from ice cream green - Tiffany blue and anything in between but Aqua/turquoise is a safe bet for a color. Any shade bright or light...there will be something similar and blend able for either gender. More More More