Red is a complicated colour to remove from hair and depending on the level of red will depend on the time it takes…I would really suggest that you do this kind of change with a hairdresser. Option one is that we would use a green based tint which cools down the colour thereby making it browner. Option 2 is to do multi colored highlights…some blonde some ash some chocolate. This is a great way to do a change.
Always happy to review a picture and do an online consultation.