do not mention using anything else like vit c powder. How does theirs turn golden and how important is this?
Old chemistry texts say all colloids have color. Science has changed, somewhat, the definition of colloid size-mainly to encompass smaller than historical definitions. Movement or “motion” is another factor in the definition and it is shown that some smaller than previously thought colloids fit. As silver colloids near previously accepted sizes they reflect or “refract” yellow light. Some electrolytes assist this by cation addition for a balancing of needed electrons to aid colloid creation. Simplistically: ion + ion = colloid. This coloration change happens naturally, to some extent, as ions pick up cations from the air which aids in their grouping into colloids. Some firms mistakenly suggest using sea salt while others offer starter solutions or even suggest using a bit of an old batch as electrolyte.
