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Equipment Discussions >> ATM, Optics and DIY Forum

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Wolfdale
member


Reged: 10/20/12

Can i use this to polish new
      #5638625 - 01/23/13 10:39 AM

Hello Tomorrow i will start with Polishing, Pitch i have already bought.
In many personal ATM sites i have read that ferric oxide can be used instead of Cerium oxide, If this is correct then can i use ferric oxide??
here i have sample image that is similar to one which found in local chemical store.


One thing i forgot to mention that in that Fe2O3 bottle it is mentioned that 95%, so what does that 95% mean?

Thanks in advance

Edited by Wolfdale (01/23/13 10:41 AM)


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Norm Meyer
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Reged: 02/08/09

Loc: Warren, ME 04864
Re: Can i use this to polish new [Re: Wolfdale]
      #5638693 - 01/23/13 11:09 AM

Wolf,
Fe203 is Jeweler's rouge and we do use that to polish glass.
The 95% probably has to do with the purity of it.
I would think you could use it to polish your mirror.

Regards
Norm

Edited by Norm Meyer (01/23/13 12:06 PM)


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FeynmanFan
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Reged: 02/18/11

Loc: N Colo front range
Re: Can i use this to polish [Re: Norm Meyer]
      #5639196 - 01/23/13 04:24 PM

I would be leery of using it since it's doubtless ungraded for particle size. Optical grade rouge has been graded. You can do it yourself, using a technique in Texereau's "How to Make A Telescope", pg. 30. No doubt further info can be found by Googling "optical rouge".

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Wolfdale
member


Reged: 10/20/12

Re: Can i use this to polish new [Re: FeynmanFan]
      #5640003 - 01/24/13 04:28 AM

Thank you

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SteveNH
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Reged: 07/10/11

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Re: Can i use this to polish new [Re: Wolfdale]
      #5640844 - 01/24/13 02:37 PM

Neal Howard's "Standard Handbook for Telescope Making" also describes a step by step method of creating a batch of washed rouge, where you siphon out larger particles from a clean rouge-water mix. The washed rouge works slowly but predictably, great for the final stages of correction. I've always used it on tempered burgundy pitch for the final stages, and found it produces a hard to beat ultra-smooth optical figure.

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JohnH
Carpal Tunnel
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Reged: 10/04/05

Loc: Squamish BC Moved!!!!!
Re: Can i use this to polish new [Re: Norm Meyer]
      #5641016 - 01/24/13 04:35 PM

Quote:

Wolf,
Fe203 is Jeweler's rouge and we do use that to polish glass.
The 95% probably has to do with the purity of it.
I would think you could use it to polish your mirror.

Regards
Norm




My brother does jewelry and uses this stuff to polish but it CAN contain larger particles that on metal would be fine, but would result in scratches on glass


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John Carruthers
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Reged: 02/02/07

Loc: Kent, UK
Re: Can i use this to polish new [Re: Wolfdale]
      #5641945 - 01/25/13 04:59 AM

I would go for optical grade cerium oxide or tin oxide or optical rouge, any contamination can result in wasted labour.
As others have said, you can elutriate the rouge you have, put it in a tall jar with a tiny drop of soap and shake it up to break down any clumps, let it settle for a few seconds so the larger particles drop to the bottom, syphon off the liquid containing the small particles still in suspension. Run the saved suspension through a coffee filter paper, dry it and store it carefully.


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Wolfdale
member


Reged: 10/20/12

Re: Can i use this to polish new [Re: John Carruthers]
      #5642401 - 01/25/13 11:41 AM

Thanks looks it like its very critical. My money wasted in buying that. I dont want my mirror to be get scratch after lots n lots of hard labour.

I will purchase cerium oxide and i hope it will not contain any larger particle.

Thanks again for the help, but using rouge will be very risky i dont know that earlier otherwise, i would not have buyed it.

BTW in our local ATM club they are using it and forced me to buy it and giving me 100% assure that there will be no problem at all.

Edited by Wolfdale (01/25/13 11:53 AM)


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John Carruthers
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Reged: 02/02/07

Loc: Kent, UK
Re: Can i use this to polish new [Re: Wolfdale]
      #5645456 - 01/27/13 04:22 AM

If the rouge comes from a good source and is for optics then use it by all means, if in doubt get fresh.

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Rockā„¢
member


Reged: 03/18/12

Re: Can i use this to polish new [Re: John Carruthers]
      #5645930 - 01/27/13 12:05 PM

Hi Wolfdale, you can use that to polish. Here also some of the people use and found no problem at all.
But be sure that it is of optical quality.


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