Hi my dyed hair is too dark from the top of my ears downwards. If I put on say a temporary colour say Harmony would that lift it and will it damage the condition of my hair?

Also, the grey bits although dyed are frizzy or wiry how can I get them to lay down and behave!

Temporary, semi or demi hair colors are deposit only colors and has no
Lightening effect. These type of hair colors will not lift your hair color or damage or damage it. However, permanent hair colors can lighten the color of the hair, depending on the strength of the hydrogen peroxide used as a developer. If you want to lighten your hair 1 to 2 shades, you can use a 20-volume peroxide with your selected hair color, but remember that permanent color can make you're a brassy or unpleasant shade. It's always best get it done professionally when going lighter.

If your hair is frizzy and wiry, it lacks moisture. Do a deep conditioning treatment once a week. You can also use a moisturizing shampoo and conditioner to restore moisture in your hair.