Quick-Light Charcoal Discs.

A match to the edge, and a thin line of sparks races across the black surface with a sound like a lit fuse. A minute later the disc glows gray and even, ready for the first grain of resin.

These flat black discs are a little larger than a coin, about 33 millimeters across, each stamped with a shallow dimple at the center to cradle whatever resin or herb you set on top. They are pressed from bamboo charcoal rather than the harsher wood charcoal of bulk discs, with a thin core of potassium nitrate that lets the spark travel evenly instead of guttering out halfway. Ten come foil-wrapped in a roll, sized to sit comfortably in most censers, shell dishes and sand-filled bowls.

Every culture that has burned resin has needed some version of this: a small, portable fragment of fire, ready on demand rather than tended from a hearth.

Details

• Material: bamboo charcoal with a thin potassium nitrate core
• Size: about 33 mm across
• Pack: ten discs, foil-wrapped in a roll

How to use

Hold a lit match to the edge until sparks catch and spread, then set the disc in a heatproof dish filled with sand or ash. Wait a minute or two for the surface to gray over and glow evenly before adding resin, since rushed coal scorches rather than releasing the scent. Burn in a ventilated room, and never leave a lit disc unattended.

A small, faithful fire, ready when the resin is.