Oxalic is a useful tool for the beekeeper. It is excellent for bleaching darkened hive wood, and it is an excellent hive box sanitizer. This oxalic acid is extra pure (99.8%) so leaves less risk of leaving heavy metal residues in your hive wood.
Warning: Some beekeepers use oxalic acid as a varroa mite management tool. Although this oxalic acid is very pure, it does not meet the packaging and other regulatory requirements for mite treatment in a beehive. It is being offered only as a wood bleaching and hive box sanitizing product. Oxalic acid must be used according to the required safety regulations.
Please use this link to access the MSDS information: