Open-ended wood cells not sealed may cause what condition in stained wood?

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Study for the California C-33 License Exam with comprehensive questions and detailed explanations. Prepare for success with our targeted practice quizzes and enhance your understanding of painting and decorating contractor requirements.

Multiple Choice

Open-ended wood cells not sealed may cause what condition in stained wood?

Explanation:
Open-ended wood cells absorb stain quickly and unevenly, so pigment concentrates in the pore openings and vessels. That uneven absorption creates localized, darker areas—blotches or dark spots—where the stain pools in the open pores. Sealing the surface before staining helps even out absorption and reduces these spots. Warping or cracking are issues caused by moisture movement and drying stresses, not by how stain enters open cells. Bleeding would involve color or extractives moving into adjacent areas under the finish, which is a different phenomenon than the pore-induced dark spots from unsealed wood.

Open-ended wood cells absorb stain quickly and unevenly, so pigment concentrates in the pore openings and vessels. That uneven absorption creates localized, darker areas—blotches or dark spots—where the stain pools in the open pores. Sealing the surface before staining helps even out absorption and reduces these spots. Warping or cracking are issues caused by moisture movement and drying stresses, not by how stain enters open cells. Bleeding would involve color or extractives moving into adjacent areas under the finish, which is a different phenomenon than the pore-induced dark spots from unsealed wood.

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