This is a link from the what to do after the shot thread. Look for a link to
scat card. This .pdf file has a number of bits of tracking information as well as the type of blood seen in a particular type of wound.

IE:

Dark Red May appear watery (non profuse) = Muscle/Bone
Bright Pink Tinted (profuse) = Heart / Lungs( if bubbles present)
etc...

http://members.w-link.net/~dick_cres...nters_page.htm

Hope it helps.