PPM of colloidal silver needs to be understood in its entirety.  PPM means parts per million.  By definition 1 PPM is 1 milligram of silver deposited in 1 liter of water (1,000 ml) (1,000,000 mg).  If one were to ingest that 1 mg. piece of silver, it would not do much good.  If you were to divide that 1 mg. into 1,000,000 particles of silver, it would then have much more efficacy because it takes one particle of silver to disable 1 pathogen.  The silver is now 1,000,000 times better than 1 piece of silver even though by definition it is still only 1 PPM.  If one were to further divide the 1 mg piece of silver into 100,000,000  particles, it would be very beneficial indeed.  And so as the silver is more finely divided the PPM by definition remains the same.

So, what really counts is not how many PPM the silver is but how many particles the silver has been divided into,  That is why it isn't necessary to have high PPM but it IS important to divide the silver as finely as possible.  To see how small the silver can be divided by our colloidal silver generators,  please look at the electron microscope photos.  It is not better to try to take high PPM colloidal silver but to take CS that is properly made.  If you think more silver is necessary, just take more of better made low PPM colloidal silver and you will be further ahead than if you took poorly made, high PPM colloidal silver. 

If the colloidal silver is properly made it will be crystal clear.  This is because the particles are too small to reflect any light.  If it shows any color, the particles are too large.  The first color seen is yellow.  As the particle size increases other colors such as red, green, blue, brown or black may be seen.  Any color seen will indicate CS that is not very good.