Six colour lay­ers paint an en­tire pic­ture

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Po­laroid film con­sists of three light­sen­si­tive lay­ers that are ac­ti­vated, as red, green, and blue light is ad­mit­ted. The light draws a neg­a­tive in the layer like a film of sil­ver crys­tals. Un­der each layer, there is a layer of yel­low, ma­genta, and cyan colour, which is re­leased by de­vel­op­ing so­lu­tion, as the cam­era spits out the film. Where sil­ver has been re­leased in the layer above, no colour is ad­mit­ted. In­stead, the colours of the two other colour lay­ers com­bine to pro­duce the colour of the light-sen­si­tive lay­ers.

In a photo of a blue sky, the light-sen­si­tive blue layer blocks out yel­low colour, whereas ma­genta and cyan pro­duce blue.

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