The cup-and-swirl method
You need three things: a tall smooth cup or a zip-seal bag, a small pinch of calcium powder, and the insects you are about to serve. Tip the powder in first, then add the insects — a meal's worth, not the whole colony — and swirl the cup gently or shake the bag with soft, short movements. Within seconds each insect picks up a thin, even film of powder across its body and legs. The goal look is lightly ghosted, as if the insect walked through flour dust, not the snowball-white coating that comes from too much powder and vigorous shaking. An over-coated insect often gets spat out or ignored, and the excess powder just ends up on the enclosure floor.
If you use a bag, leave it mostly empty of air so the insects tumble rather than bounce, and dedicate that bag to dusting so it stays dry and clean between uses.
Timing is half the technique
Dust immediately before feeding — minutes, not an hour. Live insects groom themselves constantly, and crickets in particular scrape and lick powder off within a short time of being coated. A batch dusted and then left sitting in a tub while you do other chores arrives at the lizard nearly bare. This is also why pre-dusting a whole week's insects in advance does not work: the coating is a just-in-time step, like salting food at the table rather than at the shop.
Serve straight from the dusting cup where you can. Tipping the coated insects directly into a smooth-sided feeding dish inside the enclosure keeps the film intact and keeps mobile feeders from scattering; tong-feeding one at a time works well for lizards that strike at movement.
How much powder, and what to avoid
A pinch — roughly what you can lift between finger and thumb — coats a typical serving of insects. More powder in the cup does not mean more calcium in the lizard; it means more powder shaken off in the enclosure. Keep the powder tub dry and sealed, since damp calcium clumps, coats unevenly, and spoils. Never dust insects and then drop them into a water dish or mist them heavily, which washes the coating straight off. And avoid dusting insects hours ahead and refrigerating them — the cold, still insects may survive, but the groomed-off powder does not.
For salads instead of insects, the same principle applies in sprinkled form: a light, even scatter over chopped greens, tossed once so the powder clings to damp leaf surfaces.
Making it automatic
The step most often skipped by a busy household is this one, because the lizard looks fed either way. Writing dusting into the feeding routine itself — powder type, pinch, swirl, serve — turns a memory test into a checklist anyone can follow. KinsLe's Care Teams lets you put those exact steps inside your reptile's feeding duty, so the person feeding on a school night does the dusting exactly as you would, and the completed duty is marked with a timestamp when the meal is served.