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dreamregent
sage
Reged: 04/06/09
Posts: 455
Loc: Clearwater, FL
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I got an email from someone last night that they were taking some mirrors to Spectrum Coating on Friday for coating and asked if I want to get mine done along with them. So, I have to get it ready to go and drop it off by tonight. The directions on Spectrum's website say to remove all inks (among other things) from the mirror. The back and side of mine were marked on by a sharpie marker. I've tried 100% acetone and 91% isopropyl alcohol. They worked about the same. Each took off a lot of the ink but neither was able to remove the stains completely. Is there something else I can use to take it off? ... And, just out of curiosity, what difference does ink on the mirror make to the coater?
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Building a f5.24 10" Dob
in an octagonal wood tube
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dreamregent
sage
Reged: 04/06/09
Posts: 455
Loc: Clearwater, FL
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P.S. It is a pyrex mirror.
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Building a f5.24 10" Dob
in an octagonal wood tube
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pstarr
Pooh-Bah
Reged: 09/17/04
Posts: 1280
Loc: NE Ohio
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If you used acetone and got all the ink off you could, I would say that what is left is just a stain and would not out gas while coating. I think your good to send it. The coater would be worried about out gassing of the ink when the mirror is place in a hard vacuum to do the coating. Out gassing would cause contamination and possible defects in the new coating.
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Paul
10" Home built F-6 Eq Newt. w/Zambuto mirror, built for lunar and planetary viewing.
12'x12' roll-off roof observatory
6" Home built f-6 Newt. w/Dick Wessling mirror on CG-5 Eq. mount, built for high resolution work.
4.5" Orion Starblast on Eq. mount
TV Radians 4,5,6,8,10,12,
Pentax XL 10.5mm
Pentax XW 14mm
Baader Hyperion 17mm
4&5mm UO Abbe Orthos.
3.2mm TMB planetary
TV 2.5x barlow, TV 1.8x barlow
My equipment philosophy... If it ain't broke, fix it anyway.
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dreamregent
sage
Reged: 04/06/09
Posts: 455
Loc: Clearwater, FL
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Thanks... I ended up calling the coater and they told me it was fine, just get off as much as I can.
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Building a f5.24 10" Dob
in an octagonal wood tube
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Wes James
Post Laureate
Reged: 04/12/06
Posts: 3455
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You might want to try to contact Paul at Spectrum and ask... he's very close to you- Here's his contact page.
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Wes
Atlantic Beach, FL
Some bino’s from Miyauchi 5x32 Binon's up through Garrett 20x110 Signature's,
Some telescopes from a Stellarvue 80mm NHNG up through a couple of 8” reflectors…
And a wonderful 4.25" Delmarva Shiefspiegler!
Some good friends, made here on C/N.
Oh- several cats and a wonderful wife!
Anyone want a cat???? :-O
"When your work speaks for itself- Don't Interrupt" -Gamble Rogers
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dreamregent
sage
Reged: 04/06/09
Posts: 455
Loc: Clearwater, FL
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Thanks, that's who I talked to.
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Building a f5.24 10" Dob
in an octagonal wood tube
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