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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 through which light can penetrate. The drawing is then placed over blueprint paper, prepared with a mixture of potassium ferricyanide and ammonium ferric citrate. When the attached drawing and the blueprint paper are exposed to a strong light, the unprotected ferric salt not lying beneath the lines of the drawing is changed to a ferrous salt that reacts with the ferricyanide to form Turnbull's blue. This blue is the background of the finished print. The ferric salt under the lines of the drawing, protected from the light, remains and is dissolved during the washing in water that follows exposure. As a result, the lines of the original drawing appear white in the finished blueprint.


A reproduction of a drawing by a contact printing process on light-sensitive paper, producing a negative image of white lines on a blue background; refers to architectural working drawings for construction.


(graphic arts)
A contact print, with white lines on a blue background, of a drawing; made on linen or on ferroprussiate paper and developed in water or a special solution.
A photoprint used in offset lithography or photoengraving for use in checking positions of image elements.


a photographic print of plans, technical drawings, etc., consisting of white lines on a blue background
References in periodicals archive ?
Comptel Corporation, along with a broad range of ecosystem partners, including Tech Mahindra, IBM, CloudSense, Hitachi and TATA Consultancy Services, today unveiled six, conceptually innovative industry blueprints to help guide operators digital business and IT transformations.
BluePrint Data OEMs its URL filter and content filtering databases, technology, and security products and services to Internet Security vendors such as Unified Threat Management (UTM), Managed Service Providers (MSP), Managed Security Service Providers (MSSP) and Software as a Service (SaaS) providers as well as providing private label / OEM services to Value Added Resellers (VARs), Information Technology Providers, Anti Virus and Anti Spam service providers, Independent Software Vendors (ISVs), help telecom, carriers, and ISPs and other companies.
Today s forum marks the continued commitment by the industry to drive the Blueprint s agenda forward.
All future investment in regional areas will be guided by the priorities outlined in the blueprints, Dr Nahan said.
The BluePrint Data review system consists of web site reviews that are independently categorized by multiple reviewers to ensure the categories match prior to the information being added to the master URL Review database.
Our advanced TV advertising solutions, including audience targeting through TV Blueprint and iTV offerings such as dedicated branded iChannels and in-commercial overlays, provides a new level of audience engagement, brand awareness and lead generation in television advertising.
The BluePrint Data DNS based Internet Content filter service is designed for companies to integrate into their products and services or just brand as their own Web security and Internet Filter solution.
Today, almost 100 key leaders from across Australia s agriculture sector and its supply chain will meet in Canberra to drive forward the Blueprint for Australian Agriculture.