>>8342172
There are also the various products of the reaction to be considered.
In the absence of a salt, the product will contain silver particles and silver ions, in a ratio of about 10:1. So if you measure the PPM with a TDS meter, you may see a reading of "1" because the D in TDS only refers to dissolved solids, aka ions.
This is why using a laser to see reflection of the solid (not dissolved) particles is indicated. An ion will not reflect a laser beam.
When salts are present during the reaction, more ions will be present, both silver ions and salt ions.
This is why you can not use a TDS meter alone to measure the concentration of silver in a colloid.