I need to buy some shampoo by Schwarzkopf, it's very dark blue and it's to keep blonde hair really blonde! My hairdresser uses it and I keep forgetting to ask which one it is... It's either Bonacure Colour Save Silver shampoo which is in a white bottle or Touch of Silver which is in a blue/see through bottle. Does anyone know which or whether one's just an updated version of the other? Thank you!