Lithographic limestone or slate is a type of rock that has been used for centuries in the printing industry. The word "lithographic" refers to the process of printing from a flat surface, typically using a stone or plate. The spelling of "lithographic" is [li-thuh-graf-ik] in IPA phonetic transcription, with emphasis on the second syllable. The word "limestone" is spelled [lahym-stohn] in IPA phonetic transcription, with emphasis on the first syllable. And "slate" is spelled [sleyt] in IPA phonetic transcription, with emphasis on the first syllable.
Lithographic limestone or slate refers to a type of sedimentary rock that is commonly used in the field of lithography. Lithography is a printmaking technique where a design or image is created on a flat surface, known as a stone or plate, using the principles of oil and water repulsion. These rocks are specifically chosen for their unique properties that are well-suited for this printing process.
Lithographic limestone is a fine-grained, sedimentary rock primarily composed of the mineral calcite. It is typically light in color, ranging from white to light gray or cream. This type of limestone is chosen for lithography due to its smooth texture and its ability to hold minute details. The fine-grained nature of lithographic limestone allows for precise and accurate image reproduction.
On the other hand, lithographic slate is also a fine-grained sedimentary rock that shares similar characteristics to lithographic limestone. It is typically found in darker shades such as gray, blue, or dark green. The main mineral component of lithographic slate is usually clay or mica. Just like lithographic limestone, slate possesses a smooth texture that is crucial for the success of the lithographic process.
Both lithographic limestone and slate are highly valued in lithography for their ability to retain ink, while repelling water. This property allows for the creation of detailed and high-quality prints. These rocks have played a significant role in the history and development of lithography, serving as the preferred material for the lithographic plates used by artists and printers.
A peculiar magnesian limestone, slaty, compact, and fine-grained, usually obtained from the Lias and Oolite, and extensively employed in lithography.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.