No. By definition, rainbows are red, orange, yellow, green, blue, indigo, violet - as I'm sure you've heard. Any arrangement of colors other than that is not a rainbow, although a grouping of 4 or more colours may commonly be referee to as "rainbow coloured", even though it isn't a true rainbow.
Do you see other things in colour? Have you ever looked at a colour blindness test? You can find them online. That will give you an idea if you differentiate colours that other people can.
Is it normal that the rainbows I see are in black and white?
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No. By definition, rainbows are red, orange, yellow, green, blue, indigo, violet - as I'm sure you've heard. Any arrangement of colors other than that is not a rainbow, although a grouping of 4 or more colours may commonly be referee to as "rainbow coloured", even though it isn't a true rainbow.
Do you see other things in colour? Have you ever looked at a colour blindness test? You can find them online. That will give you an idea if you differentiate colours that other people can.