when will it be delivered? How much is the delivery charge?
Standard delivery is between 3-5 working days. Non members delivery fee is £4.50 or free of charge for SAA members.
Why does the gamboge push other colours away
All pigments have different characteristics, and this is what makes using them such fun. Gamboge is quite a 'heavy' pigment which is why it pushes the lighter pigments away whilst still wet.
It is always worth experimenting with you colour to see how they work when mixed with others as you can get very surprising results.