Hello again, Recently I reported results of comparing CS production of a control batch with constant current same polarity verses a batch produced with constant current but relay switched voltage reversals. Brew time was 4 hours with constant 30 RPM paddle stirring. The result was the reversed batch was about 55% weaker than the control batch.
Ole Bob did his best to convince me I did something wrong, and that the strength of the two batches should have been about the same. I thought perhaps I was trying to make too strong a brew, and I should cut down the brew time. So I did another experiment as follows: Both cases were run for 3 hours with constant stirring at 55 degrees F starting with 0.8 uS DW. I use an electronically regulated constant current of about 1.11 ma. I didn't have quite enough voltage to draw the full 1.11 ma at the run starts, but the current was 1.11 ma for the majority of the 3 hours. Both brews look the same as the original DW-perfectly clear. Here are the results. 1) Control (no reversal): Some gunk sluffed off the wires. Starting V=174.1 & i=0.79 ma. Starting Resistance=220KOhm Ending uS=10.9, V=17.4 & i=1.13. Ending resistance=15.4KOhm uS gain due to silver ions =10.9-0.8=10.1. Using Ivan's & Frank Key's & Trem's conversion factor of 1 to 1.1, the PPM is 10.1 to 11.1. Using Ivan's recently posted formula, PPM for ions =1.3 * Rstart/Rend = 17.7. Ivan - why the big difference (17.7 compared to 10-11)? 2) Reversal: Polarity switched each 60 seconds which Ole Bob says gives the best results. Wires got black but no gunk sluffed off. Starting V=171.4 & i=0.82 ma. Starting R=209KOhm Ending uS=6.4, V=31 & i=1.12. Ending R=27.7KOhm PPM ala recent Ivan formula is 1.3 *209/27.7=9.8. uS gain due to silver ions=6.4-0.8=5.6. So PPM ala Trem et al is 5.6-6.2. So this batch is 5.6 uS/10.1 uS * 100 = 55% weaker. So, sadly, I again conclude polarity switching produces significantly weaker ionic silver concentrations. The first experiment showed that if the reversed brew time is doubled, the strength was still not as much as the non-reversed case, and black pepper-like particles began to fall off the wires. Again, I conclude that I don't see any advantage to polarity switching which justifies the extra complexity. I don't mind a bit of gunk sluff-off as I am able to decant off almost all the brew and leave the gunk behind in the jar. Someone else can continue with polarity reversal experiments - I think I have performed my last one. --Steve Young -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: silver-list-requ...@eskimo.com -or- silver-digest-requ...@eskimo.com with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: silver-list@eskimo.com Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <mdev...@eskimo.com>
