Wood is a natural, organic material. Each wooden board or bowl is absolutely individual. Is it not unusual to find small knots or slight variations in colour tone. This individuality is one of the things that makes wood so special.
Wood is "alive" and can absorb and lose moisture. Its colour tone can also be affected by exposure to sunlight. For this reason, we recommend you avoid exposing your wooden Go board to direct sunlight. In particular you should avoid partial surface exposure to sunlight, since this can lead to noticeable colour tone variations across the board's surface. You should also avoid exposing the board to one-sided heat (such as leaving the board on/near a heating device) as well as large variations in humidity.
Your Go board will thank you with many years of service!