The color contrast of the wood flooring is mainly because that the sapwood is light
color and the heartwood is darker color.
As a result, there is difference in colors between the sapwood and the heartwood, between
the young wood and the old wood.The color contrast in wood grain creates the unique
beauty of wood grain in wood flooring. And this is a beauty of the wood from nature. In
western countries like EU and USA, people there prefer this unique wood grain and color
contrast of hardwood flooring, not requiring the consistent color for the wood flooring.
Therefore, in the national standard for hardwood flooring & engineered wood flooring in
China, the color contrast is not a problem in quality.
However, in Asian countries, especially east Asian and middle Asia, people there just like
consistent color of wood flooring due to the culture. No knots,no sapwood, but just one 
color for all the wood flooring boards. In their eyes, the color difference is totally a serious
problem in quality.
Thus, we have to know well the market of our wood floorings, based on this different views
of people on the color contrast, for example, acacia wood flooring is very popular in North
America, merbau wood flooring and kempas wood flooring is popular in asian countries.
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