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Trail verse section of box elder cut down in November 1922
This shows a peculiar type of sap stain called interior blue
6 other sections not shown
acid Agri areas bleaching blue stain blue-stain fungus blued stock blued wood box until temperature brown sap stain cause cell walls closed steam box color cresol Cresylic acid crossers cylinder defect discoloration due to sap end checks favorable Figure Forest Products Laboratory fungi grade handling hardened gloss oil Hardwood Record hardwoods heartwood heat Hubert inches insects kiln brown stain kiln-dried Leave in closed Loblolly pine logs longleaf pine loss due lumber manufacture Mercuric chloride mill moisture content piling practice plank stock Pondosa pounds preventing sap stain prevention of sap rapid drying red gum remove and pile sap gum sapwood Schrenk seasoning shortleaf pine Sodium bicarbonate Sodium fluoride spores stain and decay stained wood staining and molding steaming treatment storage streaks sugar pine surface tests thousand board feet threads timber U. S. Dept unstained western white pine western yellow pine wood products yard