For a professional lab you can also try the archaeology/anthropology
dept. at Mercyhurst College in PA.  One of their specialties is
forensic work on blood residues, including species of origin.  They do
contract work, but be prepared for a long lead time.

http://mai.mercyhurst.edu/Contact%20Info/MAI_1h_contact_mai.htm

Phone:  (814) 824-2581

David Walker

Talisman Restoration, Inc.
719 Swift St. #5
Santa Cruz, CA 95060 USA
Tel:    831 425 7847
Fax:    831 425 7829
email: [log in to unmask]

>
>
>>>> [log in to unmask] 01/24 8:35 AM >>>
> Hi everyone:
>
> I have a client with a cotton Confederate (1860's) flag with stains
> that
> have historically been considered to be blood.  My client is
> interested in
> having the stains analyzed to confirm or disprove this.  I'm aware of
> fairly