32 Color changes

Change the color of an object or its external environment.
  • Forehead thermometer with liquid crystals that change colour on skin contact to indicate fever.
  • Use safe lights in a photographic darkroom.

Change the transparency of an object or its external environment.
  • Use photolithography to change transparent material to a solid mask for semiconductor processing. Similarly, change mask material from transparent to opaque for silk screen processing.

Use colour additives to observe hard-to-see objects or processes.
  • Dye in water to locate a leak.
  • Smoke in a wind tunnel.

If such additives are already used, employ luminescent or otherwise marked substances.
  • Fluorescent dye to detect cracks in metals.
  • Radioactive iodine for thyroid diagnostics.
Principe 32 : Forehead thermometer with liquid crystals that change colour on skin contact to indicate fever.


From TRIZ to ASIT

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Concrete examples

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Is this TRIZ principle frequently used?

This principle is moderately used with 147 instances in the matrix.

This principle is proposed to solve the following contradictions:

Click on a contradiction to explore it

1/18 1/37 2/17 2/18 2/33 3/18 3/28 4/28 4/29 5/18 5/19 5/21 5/28 5/29 6/21 6/27 6/28 8/25 9/28 9/29 9/33 12/17 12/18 12/28 12/29 12/32 12/33 12/38 13/17 13/18 13/21 13/26 13/33 14/32 14/33 14/35 17/2 17/12 17/13 17/18 17/28 18/1 18/2 18/3 18/5 18/12 18/13 18/17 18/19 18/20 18/21 18/28 18/29 18/31 18/36 18/37 19/28 19/38 20/18 21/6 21/13 21/28 21/29 22/18 22/25 22/28 22/33 23/2 23/33 24/9 24/25 24/32 25/8 25/22 25/24 25/28 25/34 25/37 26/34 27/6 27/18 27/28 27/29 28/1 28/4 28/5 28/6 28/7 28/9 28/10 28/11 28/12 28/13 28/14 28/15 28/18 28/19 28/21 28/22 28/25 28/26 28/34 28/37 28/39 29/1 29/4 29/5 29/7 29/9 29/12 29/18 29/19 29/21 29/22 29/25 29/26 29/27 29/33 29/39 30/18 31/18 32/14 32/24 33/11 33/13 33/14 33/23 33/29 33/34 33/36 34/5 34/21 34/22 34/25 34/39 35/14 35/30 36/29 37/11 37/25 37/28 38/12 38/18 38/19 38/27 39/29 39/34


The colour indicates the ranking of the proposed principle to solve the contradiction: 1st, 2nd, 3rd, 4th.
This ranking reflects the frequency of occurrence of the principle in the analysed patents for this type of contradiction.
When a principle appears in first position, it means that it is statistically the most used in the patents studied for this type of problem.

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