3B Scientific Equipment Set for Colour Mixing - Manual (Page 2)

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Technical amendments are possible
3. Technical data
Dimensions: 130 mm x 190 mm x
250 mm
Weight: 0.570 kg
Colour filter: 120 mm x 50 mm
4. Theory
Additive colour mixing is also called chro-
matic colour mixing. Every colour comprises
one part of the visible spectrum. By mixing
the colours, spectral bands are added. As a
result, the mixed colour is always lighter than
the respective original colours. All these col-
ours sum up to form white.
Subtractive colour mixing is also known as
pigment mixing. Individual wavelength
ranges of the visible spectrum, i.e. colours,
are filtered from the entire spectrum of visi-
ble light. In other words, they are subtracted.
Every colour added absorbs a further part of
the visible spectrum. The mixed colours are
thus always darker than the original colours.
All these colours sum up to form black.
5. Operation
Preferably conduct the experiments in a
darkened room.
• Place the base plate upon an overhead
projector.
5.1 Additive colour mixing
• Insert the red, green and blue colour
filters into the holders.
• Create a sharp image of the boundaries of
the colour filters.
• Turn the holders in such a way that the
images overlap.
• If an image depiction of only two colours
is desired, cover the middle aperture, e.g.
with a piece of cardboard.
Filter colours
Mixed
colours
Red Blue Magenta
Blue Green Cyan
Red Green Yellow
Red Blue Green White
5.2 Subtractive colour mixing
• Place the magenta, yellow and cyan col-
our filters one on top of the other onto
the projection surface of the overhead
projector.
Filter colours
Mixed
colours
Magenta Yellow Red
Yellow Cyan Green
Magenta Cyan Blue
Magenta Yellow Cyan Black