I generally recommend Shimmer Lights to platinum blondes to use sparingly as any other colour correcting/toning product. Over saturation will cause a whole new problem of grey colour in your hair or blue etc based on the main colour of the toner.
Your hair is already damaged by a chemical change and makes is susceptible to things it generally wouldn't be so it is wise to take care to also remedy the damage in your conditioning step.
Use the colour wheel to choose the right toning shampoo to alter the unwanted colouring. Yellow is toned down by purple, orange by blue, red by green etc. There are a number of products out that combine blue and green for brassy tones etc and it's important to know the actual tone you need to remove so you get the right thing. Shimmer Lights is a very strong product and is so drying it is a once in a while solution usually instead of daily. It's also a product that is great for brunettes and red head's to use to intensify their colour tho
hair loss/breakage- often in 'bleached' hair, you experience breakage and hair loss at the point of overlap of product application. This causes a very weak spot in the strand that over time will snap and break off. There is absolutely no way to prevent this if it is the cause only to slow the process as it happens until you can cut it out. This is why it's so important to have a properly trained pro apply chemical products to your hair