The quality of colloidal silver cannot be reliably judged by colour, clarity or a simple TDS reading. A defined composition, validated analysis, traceable manufacturing and a clear intended purpose for the product are what matter.
In brief
- Colour and light scattering are not sufficient quality checks.
- PPM describes a concentration, not automatically particle count, purity or effectiveness.
- Dissolved silver ions and particles must be distinguished analytically.
- Ingestion carries relevant risks; DIY production is not recommended.
What does PPM mean?
PPM means “parts per million.” In aqueous solutions, 1 ppm is approximately 1 milligram of silver per litre, provided the density and measurement definition are appropriate. However, the value does not indicate whether the silver is present as ions, nanoparticles or larger particles.
Two products with the same PPM label can therefore differ substantially in particle size, surface charge, dissolved fraction and contaminants.
Why TDS and colour are not enough
A TDS meter measures electrical conductivity and uses it to estimate the dissolved-solids content. It does not selectively measure silver and detects particles only indirectly or not at all. A yellowish colour can also have various causes and does not prove purity.
Reliable characterisation requires methods such as ICP-MS for total metal, separation methods for ionic and particulate fractions, and particle analysis, depending on the question. Such testing belongs in qualified laboratories.
Contamination and storage
The starting water, electrode material, containers and manufacturing process influence the result. Contaminants cannot be identified with the naked eye. Amber glass protects against light but does not replace analysis or hygienic manufacturing.
The product label, batch number, manufacturer’s information and a plausible testing strategy are more informative than marketing terms.
Health safety
Authorities warn against internal use of colloidal silver. Silver can accumulate in the body and cause permanent blue-grey skin discolouration known as argyria. Drug interactions and other toxicological concerns are possible.
A home-built electrolysis system does not provide controlled pharmaceutical or food quality. Manufacturing instructions and recommendations for ingestion are therefore not a responsible part of a quality assessment.
Frequently asked questions
Is a golden-yellow colour a quality characteristic?
No. Colour can be related to particles, but it proves neither purity nor a suitable size distribution.
Does a TDS device measure silver content?
Not specifically. It measures conductivity and cannot distinguish other dissolved substances from silver.
Is a higher PPM value better?
No. A higher concentration does not establish quality or effectiveness and can increase exposure.
Conclusion
Quality in silver dispersions is an analytical question. Looking only at colour, TDS or PPM overlooks composition, contamination, intended purpose and health risks.
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Source basis: reference framework: FDA, NCCIH and BfR, and specialist analytical literature on silver dispersions and particle characterisation.
Safety information: this article provides general information. It does not replace individual diagnosis, treatment or advice from qualified professionals.
