What can a yellow candle be used for?
That is a wonderful question, Michelle. Spells8 provides a whole series on candle magic. Here is the yellow candle, specifically.
I borrowed this from the series at some point from Spells8 and use it often. I hope this helps.
Edit: Marissa created the informative, BOS worthy Pentacle Color Magic 
(Hint, Hint, Francisco. LOL) The colors are close to what is used in candle magic. 
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Merry Meet @michelle21.
A yellow candle exudes brilliance,joy, and clarity. Use of this candle color (whether actually or by set intention) promotes insight, clairvoyance, or when you’re seeking the truth in spell work. It’s also popular for unhexing and protection spells. You can also use a yellow candle when seeking healing guidance, or to brighten your mood and expel depression.
Solar Deities associated with yellow candles: Apollo, Horus, and Mithras.
Blessed Be,
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Merry meet and thanks love 
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Thank u blessed be
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