Understand that 'lithographic' signifies a specific printmaking process, not general printing. They admired the fine detail in the lithographic reproduction.
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Historical Value
Lithography has historical significance in art and publishing, often found in older works. The antique shop had lithographic posters advertising vintage movies.
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Unique Textures
'Lithographic' implies a texture unique to the printmaking technique that can be recognized visually. The lithographic illustrations had a distinct grain, different from digital prints.