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Colloidal silver AquaNano Protect is a colourless product, with a grey shade (variation can exists from a batch to another). Particle dimension is in the range of 0.5-5nm, like most colourless product.
Here we should point an aspect about the correlation between the particle size and colloidal silver colour.
Normally, colloidal silver with particles bigger than 2nm is yellow in colour, when particles are crystaline in structure. Despite of this, all colloidal silver products on the market, when colourless, claim that this is because the small size of the particles. Still, tests of many so called "small particle" products, shows that size of particles is anywhere in the range of 0.5 and 20nm, still their colour is missing.
The explanation is that their particles are not crystaline in structure, but amorph. Because of this, they absorb light in UV or infrared spectrum, so their colour is missing. At best, when concentration is big, and their activity is strong, they absorb light in all visible spectrum too, so they would appear much or more gray in colour.
This being said, one must know that the only difference in colourless, gray or yellow colloidal silver is not the particle size, but particle structure. This make all types of colloidal ... almost equally good. At least when they are not plain water, because sometime this is the case.