We bought a nice Oak toy box not long ago, it was left in the conservatory for a while and we noticed a large black mark appearing, initially we assumed water had dripped on it but it now seems that it's due to the sun (we moved it inside but still in the sun and another mark appeared). I'm assuming it's adhesive, but I guess it could be the oak itself. Is there any way of protecting it / preventing it from going like this more, other than covering the top?
tia
tia