Chemical imaging to reveal the resin distribution in impregnation-treated wood at different spatial scales

•Chemical heterogeneity is a common challenge in the application of biomaterials such as wood.•Chemical imaging methods unravel spatial heterogeneity in wood on different length scales.•These methods can quantify the chemical distribution in treated wood on macroscopic and cellular levels.•Combining imaging methods provides a holistic insight into structure–property relations of biomaterials.