Date: Thu, 28 Oct 2004 21:52:27 -0400

Author: "Dick Heckathorn"

Subject: RE: additive color mixing demo




Find a supplier of color filters that are used for lighting projects. A
21 x 24 inch sheet sells for around $7.

I use Lee filters. Red #106 Green #139 Blue #119 Cyan #116
Magenta #128 Yellow #104

My supplier will give me their color booklets for workshops at no cost.
Get the Numeric Edition if you can.

I believe it was Stu Shultz out of Michigan that gave me the numbers.


Helping teachers who facilitate, motivating students who learn.
Dick Heckathorn 14665 Pawnee Trail Middleburg Hts, OH 44130
Physics Teacher CVCA 4687 Wyoga Lake Rd Cuyahoga Falls, OH 44224
330-929-0575 VM 120

-----Original Message-----
[] On Behalf Of Marc Kossover
Sent: Thursday, October 28, 2004 4:55 PM
Subject: Re: additive color mixing demo


This is a fascinating discussion since we are actually
mentioning different things than we did the last time
it came up in August. I will however repeat myself to
add to Karen's point.

--- wrote:

> The filters I mentioned earlier,
> available from Arbor
> include a spectral analysis for each color.

Arbor and Pasco sell filters, but they don't have the
same variety as you can get from a lighting supply
house. Go to look at their
choices. Your best bet, though, is to get their sample
book, which contains nearly every gel (filter) they
make along with a transmission graph for it.

And it's free.

Go to

and ask them to send you a swatch book. You also can
read the transmission curves online at

Marc "Zeke" Kossover
The Jewish Community High School of the Bay

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From Thu Oct 28 19:03:45 2004