Here Is some black rice that I used to dye some silk fabric to screen print on to.
It is possible to achieve a wide variety of colours depending on the different mordants you choose to use. Here I used Iron, alum, soda ash, copper and vinegar on various silk fabrics.
I also used natural dyes for this range of jersey t-shirts that I screen printed drawings onto.
It is possible to achieve a wide range of colours with plant dyes.
I keep a draw of samples as a reference guide to remember what plants i need to use for specific colours.