The Chenab River Bridge, a symbol of unity and engineering marvel, dazzled in the tricolor on India's Independence Day. I dyed an East Indian Rosewood bridge black to match the Blackwood fretboard before gluing it on*. What are some ways to “fix” that dye into the wood. I'm not crazy about TruOil – up to 40% mystery oil. *I did a sample on rosewood with 4 different “dyes” and. Howrah Bridge (Rabindra Setu), the lifeline of the culturally affluent city of Kolkata, is the sixth-longest cantilever bridge in the world. An engineering marvel at the time it was commissioned in 1943, the bridge stretches 655 m (2,150 ft) over the Hooghly River and carries over 100,000 vehicles. We collaborate with the world's top luthiers to create solutions and educational materials for guitar repair.