Half a croissant, on a plate, with a sign in front of it saying '50c'
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Rainbow paint

I'm not sure that this one is do-able.
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Using colored oils with different densities I wonder whether a rainbow paint could be made that would separate into layers after use.
Stirring the jar a little should result in large color bands left behind by the brush, stirring the jar a lot would make for thin stripes of color.

Japanese invent rainbow pen with help of Gabe, Tycho and Jesus http://www.yukihime...x/jesus/rainbow.jpg
[calum, Oct 04 2004, last modified Oct 05 2004]

(?) Rainbow Paint http://www.sfx.gr/spector_en.html
This is what you are looking for. [sfx, Oct 13 2009]

[link]






       I was going to paint my front-door stripey (like a barcode) some weeks back. I dreaded all the effort involved and it turning out a total mess. chez po's door is now a nice petrol blue.
po, Jun 19 2004
  

       This is how they made those swirly-color pencils, so popular when I was growing up.
phoenix, Jun 19 2004
  

       If the paint had interference particles in it, then the color could change depending on the orientation of the interference particles. The painter could use his brush technique to get the particles to lie flat, stand up, or angle in a certain direction.
robinism, Jun 19 2004
  

       In watercolor paints, different size pigment particles disperse differently. If you let a puddle of paint just bleed into blotter paper, the larger particles settle out and stay put, and the small particles seep farther across the paper. If these different size particles are very different in color, you will see bands of color.
robinism, Jun 19 2004
  
      
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