Technical Drawing of Architects' Designs

This page is the CodyCross answer for the clue below from Art Museum, Group 739, Puzzle 5 (Lively Auctions).

Question is: Technical Drawing of Architects' Designs

and the answer is: BLUEPRINT

Word Meaning:

BLUEPRINT — A type of paper-based reproduction process producing white-on-blue images by means of a photosensitive ferric compound, used primarily for technical and architecture's drawings, now largely replaced by other technologies.

Definitions from Wiktionary.