"be colored in"
A: What comes into your mind when thinking about your hometown?
B: The roofs of all the houses were colored in blue.
I have seen the sentence in a textbook and I was wondering if colored here is an adjective or just a passive voice? And the sentence is natural to you? I have never heard that "colored" can be used as a predicative adjective like this. And "be colored in" phrase is okay to use?
What do you experts think? Thank you so much as usual and have a good day.
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