TANNIN WARNING: Kwila’s superior strength and stability are attributable to its tannin-rich properties, resulting in low shrinkage and minimal surface and end splitting. Tannin is a naturally occurring substance in timber which will leach the first few times it is exposed to moisture. This product has undergone a ‘pre-bleeding’ process to reduce excess surface tannin and minimise leaching. It is important to be aware that while the pre-bleeding process has flushed out a large proportion of the timber’s surface tannin, there is still a risk of the remaining tannin leaching from the product. Tannin can stain timber, paved areas and other nearby surfaces. Objects left on the timber surface can also draw tannin out, creating surface marks.