Star Classification glass tray

Spectrum observations tell us that the stars resemble the Sun, as to the general character of their composition. Their light, like that of the Sun, emanates from a matter raised to an intense white heat, and traverses an atmosphere of absorbing vapors. Yet,  each star differs from the other, though not to an essential degree, in its chemical composition. Judging them by their spectra, they may be divided into four perfectly distinct types. 
     Looking at the stars generally, they seem brilliant, like colourless diamonds, red, orange, or yellow tinted; but if they are carefully watched, or observed through a glass, we can see next to the red or orange-tinted stars others of a blue, green, or purple colour. Spectrum analysis shows us that these colours are produced by moisture in suspense in their atmospheres.
      In the potichomania process, the glass acts as both a foundation and protective finish, saving the step of varnishing. The original intent was to recreate Greek and Etruscan vases by simulating rare and expensive Sevrés porcelain.

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