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Re: [ATM] Black Powder
Hello all
Lee Valley tools has a flocking kit available if you want to do it
yourself. You need the flocking powder and the colored glue, the kit
will do up to 15 sq ft
http://www.leevalley.com/wood/page.aspx?c=1&cat=1,250,43298,43300,44669&p=44669
One advantage to doing it this way vs the flocked paper is that it will
not peel off.
James Crombie
http://www.jamescrombie.com
Charles Mitchard wrote:
> Theres this
> http://www.newscientist.com/article/dn3356-mini-craters-key-to-blackest-ever-black.html
> I always thought that a stack of ultra sharp edges produced the
> blackest black, I'm sure I read that somewhere.
>
> Richard Schwartz wrote:
>
>>The blackest thing I know is the aperture of a large cavity that is nearly
>>black inside. In telescope making, we try to approach this level of
>>blackness with powder (millions of tiny cavities) and with baffles (a few
>>large cavities). Perhaps if BOTH are used, superior blackness may be
>>had.
>>
>>Most black coatings (I have no experience with powder) provide specular
>>reflection at grazing angles, so it is important to keep the surface area
>>subject to grazing incident light minimized. I guess this means that
>>baffles should have sharp edges.
>>
>>+++++++++++++++++++++++++++++++++++++++
>>
>>Date: Sun, 18 Nov 2007 16:59:42 -0800
>>From: "Bob May" <rmay@nethere.com>
>>One of these days I'm gonna grab all of the different kinds of
>>black out there and see what really is BLACK. I just tried some
>>Rustoleum textured black and that is rather black. I'bve got
>>several other blacks including some Floquil engine black - all of
>>the Floquil colors are very flat and the engine black is the dead
>>black.; The thing is to measure the rreflection at a very slight
>>angle of say two degrees and see how much of a light source is
>>reflected to the photosensor.t.net
>>Bob May
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>>ATM mailing list http://www.atmlist.net/
>>
>>
>>
>
>
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