What's the correct option? I find both instances on Google Books, so I'm a little confused.
Mary had black cat-eye shades and dyed blonde/dyed-blonde hair.
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Though both might have been used, I may prefer writing it without any hyphen/dash. Because we generally use hyphens and dashes for the following writings:
hyphens: when two things are intimately related. They go together: two-thirds
n dash: to show distance: Sept-Dec (it also includes months in between)
m dash: many uses; one of them is to have a break --as it's here.