Date: Tue Mar 9 16:33:44 2010

Author: Bernard Cleyet

Subject: Re: Black Paint

Post:


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Black velvet, flock, felt, and, perhaps best, is not too finely =
powdered** charcoal, the kind chemists use for flittering.

** Carbon dag is too glossy.

bc wonders about the impossible



On 2010, Mar 09, , at 13:13, Bill Norwood wrote:

> Hi Taplers,
> I want to paint a foot-square board with this so that it can be used =
as an on-off for a strobe for a free-fall expt. Is it almost as good as =
black velvet. This method would allow getting a warmed up strobe started =
then having the board removed just before the =93drop instant=94 then =
replaced in front of the strobe when the mass has struck the floor. =
(This is all about using a dim strobe for a only brief time in order to =
prevent concerns about an impossible epileptic seizure in response to =
strobe flashes.)
> Thanks, Bill Norwood, U of MD at College Park
> =20
> =20
> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] =
On Behalf Of Bernard Cleyet
> Sent: Tuesday, March 09, 2010 3:55 PM
> To: tap-l@lists.ncsu.edu
> Subject: Re: [tap-l] Black Paint
> =20
> I've used Kodak instrument black; quite satisfactorily. However, not =
in very critical uses.
> =20
> May no longer exist?
> =20
> bc old timer =20
> =20
> p.s. more recently ( ~ 25 years ago) I used an artists' water soluble =
matte black to "obscure" one side of a Fizeau mirror. (C spun mirror =
method). I suggest purchasing a variety of paints from your local =
artist supply to evaluate, if you do't receive a satisfactory answer to =
your question. Inexpensive and "immediate".
> =20
> On 2010, Mar 09, , at 09:54, Erich Burton wrote:
>=20
>=20
> I believe the 3M Black Velvet has gone through several changes,=20
> possibly ending with 3M/Mankiewicz/Nextel/Alexit 3101 Suede Coating:
>=20
> =
http://www.aktionsupply.com/products/purchase.aspx?id=3DMTAyMA=3D=3D&cid=3D=
MTAyMg=3D=3D
>=20
> This product gets referenced on a lot of astronomy websites, for folks=20=

> making their own optics.=20
>=20
> I have no experience with this paint or vendor, however.
>=20
> Good luck.
>=20
> -Erich
>=20
> --=20
> Erich Burton 3-2602 eburton@bu.edu
> Boston University Physics Department
>=20
>=20
> On Tue, Mar 9, 2010 at 12:04 PM, wrote:
> I would like to buy any of the following black paints: Parsons Black, =
3M Black Velvet Paint,or Martin Black Paint N-150-1. If you have =
purchased any of these paints lately let me know the name of the vendor. =
Thank you.
>=20
> Annie
> =20
> =20


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Black velvet, flock, felt, and, perhaps best, is =
not too finely powdered** charcoal, the kind chemists use for =
flittering.*
*
*
*** Carbon dag is too = glossy.*
*
*
*bc wonders about the = impossible*
*
*
*
*
*
*
*On = 2010, Mar 09, , at 13:13, Bill Norwood wrote:*
*
*

*Hi Taplers,*
*I want to paint a foot-square board with this so that it = can be
used as an on-off for a strobe for a free-fall expt. Is it almost =
as good as black velvet. This method would allow getting a warmed up
= strobe started then having the board removed just before the
=93drop = instant=94 then replaced in front of the strobe when the
mass has struck = the floor. (This is all about using a dim strobe
for a only brief time = in order to prevent concerns about an
impossible epileptic seizure in = response to strobe flashes.)*
*Thanks, Bill Norwood, U of MD at College = Park*
* *
* *
** tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncs=
u.edu] *On Behalf = Of *Bernard = Cleyet
*Sent:* Tuesday, March 09, 2010 = 3:55 PM
*To:* Re: [tap-l] Black = Paint**
**I've used Kodak instrument = black; quite satisfactorily.
However, not in very critical = uses.**
**May no longer = exist?**
**bc old timer = **
**p.s. more recently ( ~ 25 = years ago) I used an artists' water
soluble matte black to "obscure" = one side of a Fizeau mirror. (C
spun mirror method). I = suggest purchasing a variety of paints
from your local artist supply to = evaluate, if you do't receive a
satisfactory answer to your question. = Inexpensive and "immediate".**
** **
**On 2010, Mar 09, , at = 09:54, Erich Burton wrote:**
**I believe the = 3M Black Velvet has gone through several changes,
possibly ending = with 3M/Mankiewicz/Nextel/Alexit 3101 Suede = Coating:


making their own = optics.

I have = no experience with this paint or vendor, however.

Good = luck.

-Erich

--
Erich Burton = 3-2602 eburton@bu.edu
Boston University Physics = Department

**
**On Tue, Mar 9, 2010 at = 12:04 PM, <3D"mailto:Annie_Atiyeh@hmc.edu">> = wrote:**
**I would like to buy any of the following = black paints: Parsons
Black, 3M Black Velvet Paint,or Martin Black Paint = N-150-1. If you
have purchased any of these paints lately let me know = the name of
the vendor. Thank = you.

Annie**
**

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