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blueprint

(Encyclopedia) blueprint, white-on-blue photographic print, commonly of a working drawing used during building or manufacturing. The plan is first drawn to scale on a special paper or tracing cloth…

sky

(Encyclopedia) sky, apparent dome over the earth, background of the clouds, sun, moon, and stars. The blue color of the clear daytime sky results from the selective scattering of light rays by the…

blue-green algae

(Encyclopedia) blue-green algae, popular name for those microorganisms that are now more properly called cyanobacteria.

Blue Mountains, Australia

(Encyclopedia) Blue Mountains, region of New South Wales, SE Australia. Located W of Sydney, this elevation is actually a plateau forming part of the Great Dividing Range.

bluestone

(Encyclopedia) bluestone, common name for the blue, crystalline heptahydrate of cupric sulfate called chalcanthite, a minor ore of copper. It also refers to a fine-grained, light to dark colored blue…