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Perfect for Outdoor Photography — The Musou Black Ruler
A new product from Musou Black, the Musou Black Ruler, is now available.
This ruler is specifically designed for use in environments with strong light, such as outdoor photography, ensuring that measurement markings remain clearly visible at all times.
Why it’s different
Standard rulers tend to reflect light under strong illumination, which makes the scale difficult or even impossible to read.
In contrast, the Musou Black Ruler:
Real-world use cases
1. Structural inspections
- Used for documenting cracks in buildings
- Traditional metal rulers reflect sunlight → markings become unreadable
- Musou Black Ruler eliminates reflections → clear photos every time
2. Surveying & boundary documentation
- Used when installing boundary markers
- Provides a clear size reference in photos
- Works reliably even under strong light
3. Scientific / plant documentation
- Useful for photographing plant diseases
- Even with direct lighting → no glare, clean images
Background / Origin
The ruler gained attention after a comparison image (standard vs. Musou Black ruler) was posted online and received over 29,000 likes, which led to its commercialization.

* When viewed by the naked eye, each person's perception of "blackness" may differ depending on the lighting environment and other conditions.
Total reflectance values of our materials are based on the industry-standard AOI 8° index. Total reflectance is the measurement result of combining both diffuse reflection and specular reflection measurements. AOI 8° means that the light is incident at an angle of 8° from the normal.
For example, based on this index, our "Foam" series consistently absorbs light from ultraviolet to near-infrared light ranges. This performance is achieved by the uneven structure derived from the foaming process and the composition of carbon atoms blended into the resin.
We also offer a variety of fabrics. Our entry-level “VL Flock Sheet” is cost-effective and provides strong light-absorption performance in the visible light range. In contrast, our “IR Flock Sheet” provides improved ultraviolet and excellent infrared light-absorption performance, which are the weak points of the entry-level VL Flock Sheet. Our premium fabrics, Musou Black Fabric FR and Musou Black Fabric KIWAMI, are our blackest products and have the best visible-light absorbing performances. The FR variant is treated to be fire-resistant and is great for indoor use. Meanwhile, our flagship, Musou Black Fabric KIWAMI, is the World’s Blackest Fabric in the visible-light range.
Musou Black Paint's light-absorption performance will vary depending on the painting method, so please keep that in mind when applying. For best results, please apply with an air-brush.





