Cold-start dabbing — also called a “reverse dab” — flips the traditional sequence. Instead of heating the banger and then loading the concentrate, you load the concentrate first, apply the cap, and then heat from below. The result is a low-temperature dab that preserves more terpenes and produces exceptional flavor with less technique required.
Why cold-start works
In a traditional hot dab, you heat the banger to temperature and then have a brief window before the banger gets too cold again. Temperature management during that window determines result quality.
In a cold-start dab, you’re heating the concentrate gradually from a cold state. The vapor appears as the concentrate reaches its vaporization temperature — you can see it forming. This visual feedback tells you exactly when to stop applying heat and start inhaling. Because you’re heating gradually and stopping as soon as vaporization begins, you almost always land in the low-temperature zone by default.
What you need
- A clean quartz banger (this technique requires clean quartz — residue from previous dabs will degrade results significantly)
- Your concentrate, loaded before heating
- A carb cap that seals the banger well
- Terp pearls (strongly recommended)
- A torch
Step by step
Step 1: Start with a clean, room-temperature banger. If your banger has residue, heat it until the residue burns off, let it cool, and wipe it clean.
Step 2: Load your concentrate. Place your dab (rice-grain size for beginners) into the cold banger using your dab tool.
Step 3: Drop in your terp pearls. Add them now while the banger is cold.
Step 4: Apply the carb cap. Place the carb cap on the banger before you apply any heat.
Step 5: Apply heat from below. Using your torch, apply the flame to the bottom of the banger with a slow, circular motion. Keep the flame moving. The goal is gradual, even heating.
Step 6: Watch for vapor. As soon as you see the first wisps of vapor forming, stop applying heat immediately.
Step 7: Begin inhaling while spinning. Start your draw as soon as you stop heating. Spin the carb cap to get the terp pearls rotating.
Step 8: Continue until vapor stops. When you can no longer see vapor forming, you’re done.
Step 9: Q-tip immediately. Wipe the banger while it’s still warm.
When cold-start is the right technique
- For flavor-forward concentrates: live rosin, live resin, high-terpene badder
- For inconsistent results with hot-start
- For beginners learning on glass — the visual feedback makes it more forgiving
When to use hot-start instead
- For harder concentrates: shatter, crystalline, and some distillates benefit from a hotter surface
- When speed matters — cold-start takes longer
- With a less-than-perfect banger
Common mistakes
Heating too fast. Aggressive torch application defeats the purpose. Slow, even heating from below.
Dirty banger. The single biggest cause of bad cold-start results. Start clean every time.
Not watching for the vapor. Heating past the vapor-appearance point crosses into the medium-temp zone. Watch and stop immediately.
No carb cap or poor carb cap seal. Without a proper seal, you lose vapor and get poor results.