Sun Energy and Making Pictures Science Project Idea

Science project idea on how the sun’s energy is used to making pictures.

Sun Energy and Making Pictures Science Project Idea

How the sun's energy is used in making pictures.

You know that the light strikes the film or plate which is coated with gelatine containing a substance that is sensitive to light.When the film is put into a solution known as a developer, a black precipitate made up of minute particles of silver is produced wherever the light has struck the film.It is now washed in "hypo" (a solution of sodium thiosulphate) which dissolves out the sensitive compound which has not been touched by the rays of light.The film, on which the dark parts of the object represented are light and the light parts dark, is now called a negative.This may be placed over paper coated with a sensitive substance similar to that on the film, arid exposed to light.The print which is produced has the light and dark places arranged just as they are in the object.Explain why this is true.Light other than direct sunlight may be used, but sunlight is much more active.

Blue prints

Blue prints, which you have seen contractors and builders consulting, are copies of architects' drawings made in the following way.The drawing made in opaque ink upon transparent linen paper is placed over a sheet of paper which is coated with an almost colorless substance that becomes blue when exposed to the light.The print is then washed in water and the positions of the opaque ink lines appear white while all the remaining portion of the paper is blue.

You will recall from your study of oxidation that a change in which a new kind of a substance is produced is called a chemical change.It is evident, therefore, that the changes produced by the sunlight in making pictures and blue prints are chemical changes.

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