70% grey wanting 7.6 colour

[piersstanaway]

Hi ive been colouring my clients hair with affinage 7.01 + 3%, she wants a change the colour has faded and now wants a 7.6 result. My only concern is she has about 70% white hair how much base would you mix in to avoid glowing roots and to ensure coverage of grey??

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[rac__hel]

Is 7.6 bright red?