This is not a stain, but rather the result of the smoking process. The resulting color is an Amber hue. In the vertical-grain, the individual nodes are hard to discern. In the face-grained, each individual node is visible with about 4 node strands apparent per piece. Both orientation offer the same strength characteristics.
Personal preference is the main reason for picking a particular orientation.
Our bamboo boards are available in 6' lengths. This minimizes seams in your floor. Also available is our pre-finished bamboo option, ready to nail down. Product Specifications Passes construction standards for hardness, compressive strength, dimensional stability, modulus of elasticity, tensile strength, flammability, smoke density, adhesive strength and pest resistance. Warranty Please contact us for warranty information.