There is some debate about color. I agree that larger particles tend to make the batch yellow colored. On the other hand, the solutions with the very smallest particles measured for colloidal silver tend to be tea-colored.
I think that it is a good idea to hold silver solutions under the tongue (sublinqually) for awhile in order to get absorption before the solution reaches the stomach acid. According to the experts I have read, colloidal silver particles most easily enter the blood stream.
Another thought that many miss, is that silver solutions can be administered rectally with great absorption and in the process largely bypass the digestive system.