Particle size is a critical factor in determining the quality and stability of colloidal silver. Two solutions with identical PPM may differ greatly in clarity and performance depending on the size of the silver particles.
What Is Particle Size?
Particle size measures the diameter of silver nanoparticles in nanometres (nm). High-quality colloidal silver typically contains particles between 1–10 nm. Larger particles compromise clarity, stability, and effectiveness.
Why Smaller Is Better
Smaller particles remain suspended longer, distribute evenly, and produce a stable, clear solution. Oversized particles settle and scatter light, causing cloudiness or amber coloration.
How Particle Size Affects Colour
Clear or pale yellow solutions indicate fine particles under 10 nm. Dark yellow or brown tones suggest larger particles or contamination. Even a 10 PPM solution may vary in colour based on particle uniformity.
Factors Influencing Particle Size
- Voltage & Current: Excess voltage creates larger, unstable particles. Controlled, low-current production is key.
- Water Purity: Impurities encourage particle clumping, increasing effective size.
- Electrode Purity: Use only 99.99% pure silver rods to maintain consistent particle size and colour.
- Production Time: Longer controlled production produces smaller, stable particles.
Checking Your Solution
Solutions from The Silver Lab’s generators remain crystal clear or slightly tinted with no sediment. Cloudiness or darkening indicates oversized particles due to impurities, excessive current, or impure water.
Conclusion
Maintaining small, uniform particles ensures a stable, professional-quality colloidal silver solution. Using distilled water, pure silver electrodes, and proper voltage control are essential. For further reading, see our guide: PPM Explained: A Guide to Measuring Concentration.