Black smoke from your candle often means the wick is too long, disrupting the balance of heat and fuel, which causes excess soot and smoke. Keep your cotton wick trimmed to 1/4" and your wooden wick slightly longer. If you see black residue on the jar, it's carbon buildup from a lack of oxygen. Let the jar cool and wipe it with a damp cloth to clean.

No, it's not safe to burn a candle in a cracked glass. Even with thorough checks, small fractures can occur in repurposed liquor bottles. Always burn your candle within sight on a fire-safe surface to avoid any risks.

A memory burn is the first burn of your candle, lasting 2-4 hours until the entire top layer is melted. This ensures even burning for future use, maximizing your candle's lifespan.