Re: Trying to locate black glass with n = 1.567

From: Stephen H. Westin (westin*nospam_at_graphics.cornell.edu)
Date: 09/23/04 

Date: 23 Sep 2004 14:29:41 -0400

hybridyne2000@yahoo.com (Steve Sands) writes:

> I have been trying for days, to locate a good source for black glass
> with a refractive index of 1.567 the primary standard for specular
> gloss. I will need an ongoing supply.
>
> Can anyone recommend an alternate glass or filter that would suffice?
>
> I was thinking of Schott BG1.
>
> Thank You

Or perhaps NG1? <http://www.us.schott.com/optics_devices/english/products/catalogs.html?DD=1&U=%2Foptics_devices%2Fenglish%2Fdownload%2Fng-1.pdf>

But n = 1.52. BTW: I didn't see BG1 on the Schott US Web site. NIST
seems to have moved to transparent BaK50 in a wedge: n=1.5677.
See <http://slp.nist.gov/appearance/nadal_jct2.pdf>. 

-- 
-Stephen H. Westin
Any information or opinions in this message are mine: they do not
represent the position of Cornell University or any of its sponsors.