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    Author(s): Michael C. WiemannMark Knaebe
    Date: 2007
    Source: Research Note FPL-RN-0306. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 23 pages.
    Publication Series: Research Note (RN)
    Station: Forest Products Laboratory
    PDF: View PDF  (2.0 MB)

    Description

    The sapwood of ochoó (Hura crepitans) suffers from an oxidative stain that results in substantial loss in value, making it one of the most important utilization problems encountered among Bolivian timber species. Initiating kiln drying within 6 days of felling did not reduce staining of ochoó, although many boards with extensive interior stain had bright surfaces, so it is possible that immediate drying might reduce or eliminate discoloration. Shock treatments did not reduce staining either, except for the localized effects of surface hammering. Eighteen-hour treatment with a 5% solution of sodium metabisulfite reduced stain, although penetration was limited in many samples.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Wiemann, Michael C.; Knaebe, Mark. 2007. Reduction of Oxidative Stain in Ochoó (Hura crepitans L.) = Reducción de la Mancha de Oxidación en Ochoó (Hura crepitans L.). Research Note FPL-RN-0306. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 23 pages.

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    Keywords

    Ochoó, Hura crepitans, oxidative stain, discoloration, compression, vibration, shock treatment, sodium metabisulfite, sulfite

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