I have quite a collection of candles laughing: Most of the ones that I use are chime candles. When you are working on a spell, you have a few options once you are finished with the spell. Yes, 1 is to dispose of it, but reusing it for a spell with the same intention is also possible, saving it for a full moon cycle. You can also let the candle burn through to completion. If there is a deity that you are working with during the spell, you can let it continue to burn to completion. *(Of course any time that you are using candles, always follow Candle Safety. I have also melted them to make a whole new candle or reconsecrate the candle,
I believe we also have some topics about candles for spell & ritual use as well as disposal of them:
→ Candles: Use Once? or Reuse?
→ How to Dispose of Spell Remains
→ Used Candle Wax Disposal
There may be others, but these seemed the most relevant when I looked real quick