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Believed to be the first coupon ever, this ticket for a free glass of Coca-Cola was first distributed in 1888 to help promote the drink. By 1913, the company had redeemed 8.5 million tickets. [6] Coca-Cola's 1888-issued "free glass of" is the earliest documented coupon. [6] [7] Coupons were mailed to potential customers and placed in magazines ...
CMYK color model. Color printing typically uses ink of four colors: cyan, magenta, yellow, and black. When subtractive CMY inks are combined at full strength, pairwise combinations are red, green, and blue. Combining all three gives an imperfect black color. What appears as cerulean ( ) in the top image is actually a blend of cyan, magenta ...
Metadata about the images and the books from which they come is also available for download on Github. Pixnio – A large collection of high resolution public domain images. Free for personal and commercial use, no attribution required. Devostock.com Over 160,000 free professional images for commercial use.
Screen printing is a printing technique where a mesh is used to transfer ink (or dye) onto a substrate, except in areas made impermeable to the ink by a blocking stencil.A blade or squeegee is moved across the screen to fill the open mesh apertures with ink, and a reverse stroke then causes the screen to touch the substrate momentarily along a line of contact.
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Offset printing is a common printing technique in which the inked image is transferred (or "offset") from a plate to a rubber blanket and then to the printing surface. When used in combination with the lithographic process, which is based on the repulsion of oil and water , the offset technique employs a flat ( planographic ) image carrier.
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In general, if the image cannot be reused (including with redistribution and modification rights) by any entity, including commercial users, then the image must be considered non-free. Use of copyrighted material under an invalid claim of a non-free rationale constitutes copyright infringement and is illegal.