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2025-08-15 06:51
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Resumo–Este artigo discute a descoberta de litopônio fosforescente em desenhos de aquarela do artista americano John La Farge datados de entre 1890 e 1905 e a história do litopônio na indústria de pigmento no final do século XIX e início do século XX. Apesar de ter muitas qualidades desejáveis para o uso em aquarela branca ou tintas a óleo, o desenvolvimento do litopônio como um pigmento de artistas foi prejudicado por sua tendência a se escurecer na luz solar. Sua disponibilidade para e uso por parte de artistas ainda não está clara, uma vez que os catálogos comerciais dos vendedores de tintas geralmente não eram explícitos na descrição de pigmentos brancos como algo que contém litopônio. Além disso, o litopônio pode ser confundido com o branco de chumbo durante o exame visual e sua fosforescência de curta duração pode ser facilmente perdida pelo observador desinformado. O litopônio fosforescente foi documentado em apenas um outro trabalho até hoje: uma aquarela de Van Gogh. Além da história da manufatura do litopônio, o artigo detalha o mecanismo para a sua fosforescência e sua identificação auxiliada pela espectroscopia de Raman e espectrofluorimetria.
Titanium dioxide in food is used in a variety of products as a color enhancer. The most common foods containing titanium dioxide include:
The Crafting Process
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Understanding the Walking Foot
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6. Techniques for Sewing Leather
Mastering Blind Stitch Upholstery
Making an Informed Purchase
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Conclusion
Popular Sewing Machines for Boat Upholstery
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Some zigzag presser feet also come with adjustable settings, allowing for different stitch widths and lengths. This versatility can be particularly useful for tasks such as finishing edges, topstitching, or creating decorative techniques.