What are some ways to check your own ability to see color and test color accuracy?

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Color accuracy test

The link in your question is based on the Farnsworth-Munsell 100 hue test.

The other popular test is the Ishihara Test (test website) but that too might be too easy.

,Color - Method of Action is a more challenging test that requires you to perform a number of increasingly difficult colour-matching tasks under time pressure.

,,nThis test is based around the concept of Just-noticeable differences, which seems to be what youre after.