Can you use henna over semi-permanent hair dye?

I used to have blonde hair but it's now grown out to a dull, ash colour. Ideally, I'd like to have blonde hair but I don't want to damage my already dry hair. I've never had dark hair before, so I want to use a dark brown semi-permanent to see how it looks and (Lush) henna over the top if I like it. Will the henna be able to hold? And will it react or anything?

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