Abstract: The present invention is an efflorescence removing chemical liquid containing hydrochloric acid capable of efficiently dissolving efflorescence even in locations where the efflorescence removal work is performed in an underground space that is not adequately ventilated, i.e., in a nearly enclosed space. In addition, when the amount of hydrochloric acid exceeds 10%, the liquid is designated as a deleterious substance under Japan's Poisonous and Deleterious Substances Control Act, and hence the wastewater after efflorescence removal cannot be easily disposed of underground or elsewhere. The invention solves all of these problems. The efflorescence removing chemical liquid in the present invention is made by mixing water, hydrochloric acid, glycolic acid, and lactic acid, which makes it possible to dramatically suppress the irritating odor of hydrochloric acid by the action of lactic acid.

Abstract: A process for acetylating a wood material which comprises impregnating the wood material with an aqueous solution of an alkali metal acetate, drying the wood material containing the alkali metal acetate solution, and treating the dried wood material with acetic anhydride optionally diluted with an organic solvent at temperature between 100.degree. C. and 150.degree. C.