DIY History | Transcribe | Szathmary Culinary Manuscripts and Cookbooks | Willis Family recipe book, 1833-1861

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Page 55

Mr Temple Cheoulier's reply to an enquiry respecting the Shaking of certain colours   
I think I can make intelligible the reason of the fluctuation of colours at the border of patterns, when the ground and the pattern are of complementary colours.  White light is made up of 3 pure primary colours, Blue, Yellow, Red If these are mixed in any proportion, the remaining colours make up the corresponding complementary colours Thus, equal parts of Blue and yellow or pure Green is complementary to pure red Blue alone is complementary to Red and yellow together, or pure orange. Blue with half yellow or blue green is complementary to Red with half yellow, or orange with a greater proportion of yellow and so on for all the innumerable combinations  Now if the eye be fixed for some time upon one colour, it becomes less susceptible to that colour and more ready to take the impecepion of other colours. Thus if a red wafer is laid on a white paper in a strong light and looked at for some time and then removed, the eye now looking on the paper, receives white light or the part of the eye when the red image was before formed But the red portion of that white light produces less than its proper effect, consequently there appears a light greenish spot where the red wafer was If two wafers red and bright clear green are placed thus, and removed after a little time, two spots are seen, Green where Red was and Red were Green was      [Drawing of 4 circles 2 solid lines, 2 dashed lines, with words Red Green inside them]
Now suppose a pattern of two bright colours laid on a white ground and looked for some time then the spectral pattern would be exactly  { drawings of 2 squares with a triangle inside with the words Green/Red, Red/Green]

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Mr Temple Cheoulier's reply to an enquiry respecting the Shaking of certain colours I think I can make intelligible the reason of the fluctuation of colours at the border of patterns, when the ground and the pattern are of complementary colours. White light is made up of 3 pure primary colours, Blue, Yellow, Red If these are mixed in any proportion, the remaining colours make up the corresponding complementary colours Thus, equal parts of Blue and yellow or pure Green is complementary to pure red Blue alone is complementary to Red and yellow together, or pure orange. Blue with half yellow or blue green is complementary to Red with half yellow, or orange with a greater proportion of yellow and so on for all the innumerable combinations Now if the eye be fixed for some time upon one colour, it becomes less susceptible to that colour and more ready to take the impecepion of other colours. Thus if a red wafer is laid on a white paper in a strong light and looked at for some time and then removed, the eye now looking on the paper, receives white light or the part of the eye when the red image was before formed But the red portion of that white light produces less than its proper effect, consequently there appears a light greenish spot where the red wafer was If two wafers red and bright clear green are placed thus, and removed after a little time, two spots are seen, Green where Red was and Red were Green was [Drawing of 4 circles 2 solid lines, 2 dashed lines, with words Red Green inside them] Now suppose a pattern of two bright colours laid on a white ground and looked for some time then the spectral pattern would be exactly { drawings of 2 squares with a triangle inside with the words Green/Red, Red/Green]