Saturday, March 20, 2010

Color demo--for UArts

This image demonstrates how to get different colors using two layers--one red on clear and one blue on clear. The third, on the far right, is both of the two pieces of glass together. With the addition of yellow paint, or silver stain, one can get red, blue, yellow, white, dark purple (or near black), orange, green and lighter hues. The principle is pretty simple but can be confusing to think about. Wherever you want blue, green, yellow, or white: sandblast the red all the way off. Wherever you want red, orange, yellow or white, sandblast the blue off.
A color image such as this above can be made with the following steps. I find its best to work one plate all the way through so as not to get an incapacitating brain freeze trying to orchestrate the color relationships. So start with red and follow these steps. Remember, these aren't the laws of God inscribed on tablets and delivered to us mortals by Moses. These are just the way I do it. Sometimes. (Click the images to enlarge)
First three steps of the red plate. Stage sandblasting and flex shaft engraving.
Second three steps to completion.
First three steps of blue plate.
Last two.

Let me know if you have questions!


Jx said...

Hmmmm. my brain is a bit after-partyish this morning and creaking loudly, but is it right in thinking that in the top colour samples, would you have to flip the blue panel to get the result on the right?

Judith Schaechter said...

How you orient the panels is up to you--but if you want the two layers of flash to be flush--then YES YES YES the image must be flipped over.

Thanks so much for pointing that out!!!

Jx said...

Oh good, it wasn't just my hangover talking!

Here's what confused me about the first image:

> top right square on red sampler = all red

> top right square on blue sampler = no blue

> top right square on both together sample = black

When what I expected to see was all red + no blue = red

So it looks like you have to turn the blue panel over, rather than just slide it over or under the red, to get the results on the right.