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1.3

Minor Versionm

by Procheta Mallik

Introduction

If you use sketch pens of different colours, and start colouring them on a filter paper, one by one, on top of each other, you will soon notice the blob turns black.

Tools

No tools required.

Parts

  1. Take any 3 light-coloured sketch pens; we have used pink, yellow and blue.
    • Take any 3 light-coloured sketch pens; we have used pink, yellow and blue.

    • Take a filter paper .

    • Draw a circle and fill it in with any of the colours, pink in our case

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  2. Make another circle with another colour (blue, in our case)
    • Make another circle with another colour (blue, in our case)

    • Colour in the circle

    • Make a third circle with the third colour (yellow here)

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    • Colour it in yellow

    • You should notice that the colours when drawn on top of each other create a darker and darker spot. A few more added in, and you'll get pretty close to black!

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    • Filter paper can tear easily, so do not colour in with too much pressure, especially at the intersection of colours.

    • Using darker hues may create a black spot with just 2 colours, so use lighter colours for a better effect

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    • We often call white light a mixture of many colours; how come mixing colours here is creating black and not white?

    • What is the difference when we mix different coloured light with each other (e.g. light from red and green LEDs) compared to what we have done here?

    • Do the same experiment with different sets of colours.

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Finish Line

Procheta Mallik

Member since: 05/02/2017

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