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So... I'm new to candle making; I got some paraffin (nobody here sells soy wax), molds, stearic acid and other ingredients. Today I was trying the second candle I made; it was not a small candle at all, it was about 6cm x 10cm; I used about 240 grams of wax for it, plus stearate, color and fragrance.

It looked pretty ok, I light it a while ago, left home and when I came back roughly 5 hours later, I found this:

messy melted candle

So, what might be possible causes for this? What did I do wrong? One thing I know for sure I did different from another candle I made a while ago is this time I used a somewhat thicker wick. Could that be the reason? Was that one of many contributing factors?

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    You left a candle burning for five hours while you were away? – Joachim Jan 5 '19 at 10:53
  • It does seem like the wick might cause to much wax to heat up a lot more than it needs to keep burning. Otherwise, it must be the consistency of the wax, having too low a melting point. – Joachim Jan 5 '19 at 10:56
  • I have little to no experience with candles but agree with @Joachim, you shouldn't left! However from the pattern and my past experience, I guess the wax was melting inside the candle without enough heat to melt the surrounding but at some point finally the wall can't withstand the heat and melts then there's a flow of wax. (This was what happened to mine). – user174174 Jan 5 '19 at 12:26
  • @Joachim it was meant to be a Yahrzeit candle. Could it also have had to do with it not having a proper container? – Gregorio Litenstein Jan 5 '19 at 14:39
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    Check out this link which suggests that stearic acid can adversely affect paraffin melting point in low percentage by weight doses. – Henry Taylor Jan 5 '19 at 22:51

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