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Resumen–En este artículo se discute el descubrimiento del litopón fosforescente en dibujos a la acuarela por el artista americano John La Farge, fechados de 1890 a 1905, y la historia del litopón en la industria de los pigmentos a finales del Siglo XIX y principios del Siglo XX. A pesar de tener muchas cualidades deseables para su uso en pintura para acuarela o pinturas al óleo blancas, el desarrollo del litopón como pigmento para artistas fue obstaculizado por su tendencia a oscurecerse con la luz solar. Su disponibilidad para los artistas y su adopción por ellos sigue siendo poco clara, ya que por lo general los catálogos comerciales de los coloristas no eran explícitos al describir si los pigmentos blancos contenían litopón. Además, el litopón se puede confundir con blanco de plomo durante el examen visual, y su fosforescencia de corta duración puede ser fácilmente pasada por alto por el observador desinformado. A la fecha, el litopón fosforescente ha sido documentado solamente en otra obra mas: una acuarela por Van Gogh. Además de la historia de la fabricación del litopón, el artículo detalla el mecanismo para su fosforescencia, y su identificación con la ayuda de espectroscopía de Raman, y de espectrofluorimetría.

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{随机栏目} 2025-08-15 02:39 1916
  • The automatic threader on a serger machine is a game-changer for sewers who may struggle with threading a traditional sewing machine. With just a few simple steps, the automatic threader on a serger machine can save you time and frustration, allowing you to focus on your sewing projects rather than dealing with the hassle of threading.
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  • Lock stitch is one of the most fundamental and widely used types of stitches in sewing, providing both strength and durability in various textiles. This article delves into the workings of lock stitch on sewing machines, its applications, and its significance in the world of sewing.


  • Fabric Thickness

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  • 4. Adjust the tension The tension settings on your sewing machine may need to be adjusted when using a double needle. Experiment with different tension settings to achieve the desired stitch quality. It's a good idea to test the tension on a scrap piece of fabric before sewing on your project.
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    sewing machine needle for faux leather. It's always a good idea to have a few different sizes on hand to test and see which one works best for your specific project.
  • The Rise of Leather Sewing Machine Companies Crafting Quality and Precision


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  • What is a Coverstitch Machine?


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  • Preparing Your Sewing Machine


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  • Applications


  • - Use the Right Thread Opt for polyester or nylon thread, as these materials provide strength and durability, essential for leatherwork.


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  • 2. Needle Compatibility The ability to use different needle sizes is crucial. A thicker needle can penetrate dense fabrics without breaking or bending, ensuring clean stitches and a successful project.


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