Re: weird Sharpie residue
¿ªÔÆÌåÓýCould still be micro-fractures.
?
One thing I do is use a 3-5mw green laser pointer.? I hit the
mirror at an angle and if I can see a green dot on the surface of the mirror
then I know that I am not done polishing.
?
?
Christopher
Erickson
Consulting Engineer Summit Kinetics Waikoloa, HI 96738 www.summitkinetics.com ? From: VacuumX@... [mailto:VacuumX@...] Sent: Monday, February 23, 2015 4:19 PM To: VacuumX@... Subject: Re: [VacuumX] weird Sharpie residue 1. You cannot see the marks at all with the
naked eye. AT ALL.
2. ?I believe the
mirror is fully polished.?
3. The only way I can
tell something weird is going on is after we've washed the mirror thoroughly
with Alconox and/or powdered calcium carbonate and rinsed it thoroughly and let
the water flow off: What happens then is that the line and marks that I
drew re-appear as if a magical water-mark arose where the marks used to be. I
didn't take any photos at the time. I should say, "water-mark descended" rather
than "arose": the sheet of water was very uniform except that it was a little
thinner where the marks used to be. You could read the markings very clearly as
if there was a scar on the surface of the water. Not at all visible in any way
on the dry glass.?
?
Guy Brandenburg, Washington,
DC? http://gfbrandenburg.wordpress.com/ http://home.earthlink.net/~gfbranden/GFB_Home_Page.html ============================ From: "'Christopher Erickson' christopher.k.erickson@... [VacuumX]" To: VacuumX@... Sent: Monday, February 23, 2015 3:43 PM Subject: RE: [VacuumX] weird Sharpie residue Agreed.? If the marker isn't coming off then the
mirror polishing isn't finished.
?
?
Christopher Erickson
Consulting Engineer Summit Kinetics Waikoloa, HI 96738 www.summitkinetics.com ? From: VacuumX@... [mailto:VacuumX@...] Sent: Monday, February 23, 2015 7:55 AM To: VacuumX@... Subject: Re: [VacuumX] weird Sharpie residue The only time Sharpie marker
dont come off a mirror I am working on is when the mirror is not fully polished
out.? Even a mirror that looks polished can still have quite a rough
surface that traps dye or lets it get under the top layer of glass.? I have
put on squiggle lines that took hours of polishing to fully remove because the
dye got under the top layer of glass.? Till that top layer is polished off
the marks remained. ?
I would be inclined to polish the surface and remove the marks.
?
Can you take a pic or two of the inside of your chamber so we can see what
"classic vac" looks like ???
Drew in sunny Florida
??
On Mon, Feb 23, 2015 at 12:32 PM, Guy
Brandenburg gfbrandenburg@... [VacuumX]
<VacuumX@...>
wrote:
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Christopher Erickson