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I suppose there is one other thing worth mentioning, the actual colour of H-alpha is not subjective.
It has a specific frequency, just as for example, some sounds have a specific frequency: eg Middle C at 261 Hz.
In the case of H-alpha, 652nm equates to a frequency of about 458Thz.
While some individuals may be tone deaf or colour blind, this has little to do with the pitch of a note or colour of a light wave.
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