You're going to lose this argument. A colloid is a solution in which the particles within it remain uniformly distributed. That is not true of blood. Blood cells separate out of a solution of blood quite easily upon standing.
Blood plasma you can probably make a case for but not blood as a whole.
That is not even the best part though. Even if blood is considered a colloid I don't see how colloidal silver would automatically be good for health. Could you cite a study for the 650 number?
As for developing resistance, well bad research again...
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