How does a Po­laroid cam­era work, and can a so­lar sys­tem have two stars?

Film was tra­di­tion­ally de­vel­oped in spe­cial so­lu­tions in dark­rooms, so how are po­laroid pho­tos de­vel­oped in a few sec­onds?

Science Illustrated - - CONTENTS -

Pho­tos taken on film usu­ally re­quire film rolls, a dark­room, and light-sen­si­tive chem­i­cals to be de­vel­oped. A po­laroid cam­era unites all the el­e­ments of the process in its in­te­rior by in­clud­ing film and chem­i­cals in the same pa­per.

In a film cam­era, the film re­acts as light is ad­mit­ted through the lens, pro­duc­ing a neg­a­tive – an im­age, in which the light of the sub­ject ap­pears in its own com­ple­men­tary colours. Red be­comes cyan, green is ma­genta, and blue turns yel­low. In a dark­room, light is shone onto the neg­a­tive, and the photo emerges on

pho­to­graphic print­ing pa­per. The chem­i­cals of the photo pa­per are ex­tremely sen­si­tive to light, and so, the de­vel­op­ment must take place in com­plete dark­ness.

A po­laroid cam­era is a fast-work­ing dark­room, in

which light is only ad­mit­ted briefly after press­ing the shut­ter re­lease but­ton. The light pro­duces a neg­a­tive on a piece of lay­ered film, while the two rolls that push the pa­per out of the cam­era add chem­i­cals, which fill out the ar­eas of the the neg­a­tive that have not al­ready re­acted. A few sec­onds later, the cam­era has pro­duced a photo.

New po­laroid cam­eras can be ad­justed ac­cord­ing to the light and con­nected with phones.

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