Depending on the patience required
Cool or warm, blond hair requires maintenance and patience. Patience first and foremost at the hairdresser. Because the further away the colour is from your natural pigmentation, the more research (and regular appointments, and therefore a budget!) you will need to be prepared for. For maintenance, depending on the shade you choose, a shampoo that eliminates brassy tones will be good if your blonde is cool, and a shampoo for coloured hair if it is warm. And don't forget repairing and nourishing products to repair the hair fibre, which goes through a lot during depigmentation!