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铁杉是一种优良的针叶材。它纹理细致，材色漂亮。但是，经常由于干燥或保管不善而导致铁杉材面发生蓝变或红变。我们通过一系列的氧化－还原反应，来除去蓝变或红变。
Hemlock is a fine softwood. It is detailed texture, color beautiful. However, the hemlock face is often blued or reddish due to poor drying or poor storage. We removed blue or red through a series of oxidation-reduction reactions.