A glue stain is caused by a reaction that occurs between the water in the glue, the iron in the clamps, and the ____ in the wood, and stains may be blue, blue black, or green to greenish black.
A) oxide
B) tannin
C) oxygen
D) carbon

Question

Quizplus · Accepted Answer

The reaction that causes glue stains in wood involves the water in the glue, the iron in the clamps, and the tannin in the wood. Tannin is a natural compound found in wood that can react with iron and oxygen to create a blue to greenish-black stain. Therefore, choice B (tannin) is the best answer. Choice A (oxide) and C (oxygen) are not directly involved in the reaction, and choice D (carbon) is not a component in the wood or glue that causes the stain.

A Glue Stain Is Caused by a Reaction That Occurs