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This article discusses the discovery of phosphorescent lithopone on watercolor drawings by American artist John La Farge dated between 1890 and 1905 and the history of lithopone in the pigment industry in the late 19th and early 20th centuries. Despite having many desirable qualities for use in white watercolor or oil paints, the development of lithopone as an artists’ pigment was hampered by its tendency to darken in sunlight. Its availability to, and adoption by, artists remain unclear, as colormen's trade catalogs were generally not explicit in describing white pigments as containing lithopone. Further, lithopone may be mistaken for lead white during visual examination and its short-lived phosphorescence can be easily missed by the uninformed observer. Phosphorescent lithopone has been documented on only one other work-to-date: a watercolor by Van Gogh. In addition to the history of lithopone's manufacture, the article details the mechanism for its phosphorescence and its identification aided by Raman spectroscopy and spectrofluorimetry.

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  • After the installation is complete, test the access panel by opening and closing it a few times. Ensure it operates smoothly and securely. If the panel is a swing-open type, it should not be too loose or too tight. Alternatively, if it is a removable type, ensure it is easy to detach for maintenance.


  • Types of Ceiling Attic Access Doors


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  • - Food and Beverage Industry The need for cleanliness and hygiene is paramount in food processing plants. Watertight panels ensure that procedures are in place to prevent contamination from water or foreign objects.


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  • - Plywood or drywall For the panel itself, ensure it matches the existing ceiling material.
  • 6. Finishing Touches Add any necessary light fixtures or additional decorations to complete the look.


  • Plastic drop ceiling grids have emerged as a popular choice in various construction and renovation projects, thanks to their versatility, lightweight design, and resistance to moisture. These grid systems are an innovative solution for creating suspended ceilings, which can significantly enhance both the aesthetic and functional aspects of any space. This article will delve into the benefits, applications, and installation process of plastic drop ceiling grids.


  • Occupancy Conditions

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  • 5. Finishing Touches Finally, finish the edges with joint compound and paint as necessary to ensure it blends in seamlessly with the ceiling.


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