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acrylic prints pattern acrylic prints colors acrylic prints colour acrylic prints colours acrylic prints education acrylic prints film acrylic prints fluid acrylic prints gravity acrylic prints interference acrylic prints interfering acrylic prints iridescence acrylic prints iridescent acrylic prints light acrylic prints liquid acrylic prints motion acrylic prints

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Colours in a soap film. The colours are produced by the interference of light waves reflected from the upper and lower surfaces of the film. As the thickness of the film is of a similar magnitude to the wavelength of visible light (dozens to hundreds of nanometres), the interference patterns appear as bands of colour, related to the thickness of the film. Thicker walls cause interference at longer (redder) wavelengths, so appear bluer and greener. As the film thins through evaporation or other processes, the reflected light cancels out yellow then green then blue light, appearing blue, magenta and golden yellow, before becoming too thin to support itself, and popping.

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