So I found this astrological chart that was black and white and decided to color it according to the Homestuck Hemospectrum. All the cannon troll signs are the correct color. Except for Vantas ,but he is a mutant blood so he doesn't count. I took some liberties with the other signs by mixing the colors depending on where they are placed in-between the cannon ones. Edit: (Also UU is not a troll and does not effect this chart even though the symbol is on it)
I am not too fond of black and white bloods, but I still felt like they needed a place.
This is my own personal take on the possible colors that could appear as natural blood colors. If you have a different opinion that's fine and dandy too.
Homestuck © Andrew Hussie
Here is where I found the blank chart[link]