Yellow streaks in bleached red oak floors

last month

Does anyone know what is causing the yellow highlighter colored streaks in our floors? This is a small section at the entrance of our kitchen that is original red oak flooring (not certain what timeframe it was installed but the house is about 100yrs old). We had our contractor use the same process as on our new red oak floors - hydroxide and hydrogen peroxide bleach - expecting to get similar results, but it came out much lighter than the new flooring and it has these yellow streaks that look really bad. The photos are of the transition from original flooring to new flooring, some close-ups of the yellow streaks, and one of the original flooring before renovation.

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