Needless to say the chemicals are not identified, and in any case I would prefer to develop something independently and publish it on the web without having to worry about the manufacturer saying that I've ripped off their product.
So what I need is three distinct blood chemicals, each producing a precipitate when mixed with the appropriate "antibody", but not precipitating when mixed with each other or the other "antibodies". Harmlessness would be a plus, and they need to be miscable with food dye and water to look vaguely like blood. The precipates should look like little blobs of clotting if possible.
Any suggestions? Or anyone know of a web site I've missed that describes a suitable set of chemicals?