Is there any particular rule for specific colours in adjective order?

I read here that there is a general rule to write an adjective order. But I didn't find any explanation if the rule has a specific order for colours, especially for primary colours.

This may sound stupid but I'm just wondering. I mean is it preferable to say:

red and white flowers

Or:

white and red flowers

Or is there really no grammatical rule to obey?

Answer

I mean is it preferable to say:

red and white flowers Or:

white and red flowers

Or is there really no grammatical rule to obey?

No, there is no rule, you can use any order you like:

"There were white, red, purple and pale-blue flowers on the table" is correct with any permutations of the colours