Welcome @KylieEy and @michael9!
While I don’t recommend reusing materials that may have taken on negative energy (for example, materials used in Black/Baneful Magick or for drawing negative energy- I’d suggest ritually disposing these), I agree with Benjamin about the benefits of repurposing 
I think the act of repurposing can give used materials a new life, which can then be used anew for different spellwork. For an extra boost, you could incorporate some element of cleansing to clear the energy as part of the repurposing process 
Good luck and blessed spellwork! 