Re: Painting with blood as medium
From my wife, the med lab tech: if you can get the blood to stain a raw canvas, perhaps linen, then the iron in the blood will stick around (soak in) and maintain the stain.
Blood is problematic, because all flesh decays. We talked about preservative agents added beforehand, but the only agents she knows that are used in a lab setting are anticoagulants to prevent the blood from becoming solid and being difficult/impossible to process in the lab equipment. If you use the blood before it coagulates, that should be sufficient to allow it to stain the canvas.
Perhaps the more important thing is to use a sealant instead to encapsulate it and the canvas. A gel medium (or a GAC medium from golden - perhaps 100 the sealant?) may be all you need, probably applied to both sides of the canvas. Maybe you won't even require raw canvas in this case.
Blood won't be anywhere near lightfast, of course, so you may want to use a UV filtering varnish? And let the buyer (?) know that a darker room and subtler lighting will make the painting last longer.
Comments and critique actively sought and much appreciated!
Rick. . . . . . . . . . . . . . . . . . . . . . . pigment storm . . . watch the paint flow!