samples within the following 24 h after color determination.
Wood blocks from each staining level were impregnated (n ¼ 3)
with red, yellow and green water-based pigmenting solution, in
three different 250 mL glass beakers. Samples were placed in the
flask and the pigmenting solutions were added to complete 170 ml.
A plastic mesh was used to ensure the total immersion of the
sample into the solutions. Afterwards, the beakers were located
inside a glass desiccator connected to a vacuum network. Vacuum
impregnation was performed at room temperature, 64.3 kPa for
24 h. After treatment, wood blocks were dried overnight at 65 C for
24 h and color and digital images of tangential and radial faces were
measured and acquired, respectively, in the chroma meter and
scanner (as described above). Samples were then ripped along the
axial axis for acquisition of digital images from the inner sections.
Internal color coverage was calculated from digital images by using
ImageJ (as above). Color difference in tangential and radial surface,
after vs before treatment, were calculated from CIE L*a*b* parameters