HG parquet colour renovator (HG product 68) pulls deep into the wood and activates the existing pigments. Because of this, bleaching spots and circles, and sun-faded places back to their original color.
Apply HG parquet colour renovator on with a cloth. Now the first six to ten hours, let sit. Interim fully retracted, re-treat places. After the treatment, the excess material wipe with a clean cloth.