Author Topic: Greenish color  (Read 2226 times)

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Offline chrisflhtc

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Greenish color
« on: October 06, 2016, 09:08:09 AM »
Hi all I remember reading somewhere here what it means if the Colloidal Silver is a little greenish but I cant find it could someone refresh my memory please.My latest batch of karo reduced gelatin capped Colloidal Silver is slightly yellow/green colored.TIA
Chris

Offline kephra

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Re: Greenish color
« Reply #1 on: October 06, 2016, 09:34:33 AM »
It means the particles are slightly smaller.
https://www.cgcsforum.com/index.php?topic=1292.msg10542#msg10542
Colloidal Silver is only a bargain if you make it yourself.

Offline chrisflhtc

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Re: Greenish color
« Reply #2 on: October 06, 2016, 11:47:48 AM »
 Thanks for the quick reply.It is still good for what we use it for right? Better or worse and why are they smaller particles.
Thanks
Chris

Offline kephra

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Re: Greenish color
« Reply #3 on: October 06, 2016, 11:51:35 AM »
Yes still good.
Colloidal Silver is only a bargain if you make it yourself.

Offline PeterXXL

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Re: Greenish color
« Reply #4 on: October 06, 2016, 02:24:57 PM »
It means the particles are slightly smaller.
https://www.cgcsforum.com/index.php?topic=1292.msg10542#msg10542

Or it means that the nanoparticles are not spherical but more like rods in shape, so that both blue light AND red light reflects away from them, and the absence of the two colors blue and red have the complementary color of - Green!

Offline Art

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Re: Greenish color
« Reply #5 on: October 06, 2016, 09:04:44 PM »
Quote
Colloidal Silver is only a bargain if you make it yourself.

You couldn't be more right than that, Kephra!

Art

Offline chrisflhtc

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Re: Greenish color
« Reply #6 on: October 07, 2016, 08:17:24 AM »
I would still like to know why normally my batches are a bright baby shampoo yellow or golden yellow what could have changed? amount of electrolyte temperature amount of karo? I run 15ma and my voltage is always above 15 vdc. I just want to be consistent.
Chris 

Offline kephra

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Re: Greenish color
« Reply #7 on: October 07, 2016, 08:31:58 AM »
A few things to check:
Did you use a new batch of distilled water?
How old is your Karo dilution?
Did you clean you glassware with peroxide?  Did you rinse it sufficiently?

Colloidal Silver is only a bargain if you make it yourself.

Offline chrisflhtc

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Re: Greenish color
« Reply #8 on: October 07, 2016, 08:57:40 AM »
This was the last liter of the DW I have been using, I use straight karo and the glass had just been cleaned with h202 and rinsed well.
Chris

Offline Stagno

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Re: Greenish color
« Reply #9 on: October 11, 2016, 07:17:06 AM »
Adding extra electrolyte raises the pH which raises the zeta potential which leads to smaller particles,that may account for it. I did some experiments a year or so ago and ended up with an almost lime green batch when using 70 drops of molar sodium carbonate (roughly 3ml in 1litre).
"To acquire knowledge, one must study; but to acquire wisdom, one must observe"

Marilyn vos Savant

Offline chrisflhtc

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Re: Greenish color
« Reply #10 on: October 12, 2016, 07:32:19 AM »
Adding extra electrolyte raises the pH which raises the zeta potential which leads to smaller particles,that may account for it. I did some experiments a year or so ago and ended up with an almost lime green batch when using 70 drops of molar sodium carbonate (roughly 3ml in 1litre).
I believe this is it I remember adding a bit extra when I was making that batch because my ph paper was calling for more to get to 7.5-8