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Limestone grave with lichens when exposed to...in Calvert Cemetery. Calvert, Texas  
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Limestone grave with lichens when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight in Calvert Cemetery. Calvert, Texas, November 3, 2024

Location on mapsEast Burnett Street, Calvert, Robertson County, Texas, 77837, United States
#3638-21
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The image presents a comparison of a limestone grave's appearance under regular daylight and when exposed to ultraviolet (UV-A) blacklight illumination. The top portion of the image shows the grave illuminated by natural light, while the bottom portion displays the same area after being lit up with a 365 nm UV-A blacklight.

**Image Details**

* **Top Portion**
* The limestone is covered in lichens.
* The surface appears to be weathered and worn down.
* No significant details are visible on the surface of the stone or any text inscriptions.
* **Bottom Portion**
* After being illuminated by a 365 nm UV-A blacklight, the limestone exhibits a lighter shade compared to its appearance under natural light.
* The lichen growth has turned white, which is characteristic of how lichens respond to ultraviolet light exposure.

**Conclusion**

The image effectively demonstrates the impact of UV-A blacklight on the appearance of limestone surfaces. This technique can be useful for detecting inscriptions or other markings that may not be visible under regular lighting conditions. – AI vision

La tumba de piedra caliza con líquenes cuando se expone a la luz del día normal, así como cuando se ilumina con una luz negra ultravioleta (UV-A) de 365 nm en el Cementerio de Calvert. Calvert, Texas, 3 de noviembre de 2024. La imagen presenta una comparación de la apariencia de una tumba de piedra caliza bajo la luz del día normal y cuando se expone a iluminación ultravioleta (UV-A) negra. La parte superior de la imagen muestra la tumba iluminada por luz natural, mientras que la parte inferior muestra la misma área después de ser iluminada con una luz negra UV-A de 365 nm. **Detalles de la Imagen** * **Parte superior** * La piedra caliza está cubierta de líquenes. * La superficie parece erosionada y desgastada. * No hay detalles significativos visibles en la superficie de la piedra o inscripciones de texto. * **Parte inferior** * Después de iluminarse con una luz negra UV-A de 365 nm, la piedra caliza muestra un tono más claro en comparación con su aspecto bajo la luz natural. * El crecimiento del líquen se vuelve blanco, lo que es característico de cómo los líquenes responden a la exposición a la luz ultravioleta. **Conclusión** La imagen demuestra efectivamente el impacto de la luz negra UV-A en el aspecto de las superficies de piedra caliza. Esta técnica puede ser útil para detectar inscripciones u otras marcas que puedan no ser visibles bajo condiciones normales de iluminación. – Spanish translation


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