"it" refers to "house," I think.
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Anonymous It is blue. Is 'It' the pronoun of color or house?"my house".
Anonymous It is blue. Is 'It' the pronoun of color or house?blue is an adjective here and, as such, cannot be substituted with the pronoun It.
Anonymousblue is an adjective here and, as such, cannot be substituted with the pronoun It.Nobody is substituting "it" for "blue" in the sentence "It is blue". That would result in "It is it".
CalifJimNobody is substituting "it" for "blue" in the sentence "It is blue".I see.