Bitter aftertaste in colloidal silver

So I've purchased two bottles of colloidal silver at 18ppm with extremely tiny particle size. Today it arrived and I drank 10ml for my abscesses tooth. When I initially put it in my mouth there was no taste, and I start swishing around my mouth, still no taste. But when I went to swallow it little by little, I start to get this bitterness at the back of my throat. Not sure if this is normal?