Cassens, D. L.
1991 FNR-90, Marketing and Utilization, Cooperative Extension Service Purdue University, West Lafayette
Cassens, D. L., (1991), "Sap stain in hardwood logs and lumber", FNR-90, Marketing and Utilization, Cooperative Extension Service Purdue University, West Lafayette.
Abstract:
The problem of stain and its prevention in logs and lumber is receiving increased attention by all lumbermen. Stain is considered a defect in the upper grades of all hardwood species. Log prices have increased to the point where the devaluation or loss of even a small proportion of each log that produces high grade lumber causes considerable economic loss. Hardwood lumber experts have increased substantially. This market is particularly quality conscious and demands bright lumber.
Even after stain-free logs are turned into lumber, the problem does not end. Lumber, especially sapwood, can be discolored by molds, stains, and chemical reactions before it is dried.
Then, too, capital investments in sawmills and their producing capacities have increased. High overhead costs require these mills to operate throughout the year. In turn, these operating requirements and increased mill capacities require that large log inventories be maintained. Large inventories during warm weather increase the likelihood of stain.
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