The correct expression is 'Blueprint' because this is the noun intended. The word 'Blue' is an adjective...well, it can be a verb as in ....I'm feeling blue....but usually it's used to describe some other word, such as, ....pass me the blue pen.
Monday, May 31, 2010
Blue prints vs Blueprints
There are a few instances where we see expressions like this: ....Blue prints for success....
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