How to Take Care of Your Chasen and Matcha Tin

Most of the attention in matcha goes to the powder itself, the cultivar, the region, the flush. Far less goes to the two small tools that determine whether that powder actually performs once it is in your kitchen: the whisk you make it with, and the container you keep it in.

Both are simple objects. Both are also easy to damage through habits that feel harmless. A chasen ruined by soaking too long, or a tin left open on a sunny counter, will quietly undo the work that went into growing and shading the tea in the first place. Here is how to actually look after them.

Caring for Your Chasen

A chasen is a single piece of bamboo, split into dozens of fine tines and shaped by hand. Nothing about it is synthetic or reinforced. Every habit that touches it either extends its life or shortens it.

Before First Use

A brand new chasen is stiff. The tines have not yet been worked, and whisking with a stiff chasen risks snapping the more delicate outer tines before they have had a chance to loosen. Dip just the prongs in room temperature water for a short soak, no more than a minute or two, before your first use. This softens the bamboo slightly and makes the tines more flexible without saturating the handle.

During Use

Whisk in a light "M" or "W" motion just above the base of the bowl, not pressed hard into it. Pressing the tines flat against the bottom of the bowl is the single most common way people bend or snap them, usually while trying to break up a stubborn clump rather than sifting the matcha properly beforehand.

If you are whisking for a cafe menu rather than a single cup, expect the whisk to wear faster with high volume use, and inspect it periodically through a shift rather than waiting for a visible break.

After Use: The Part Most People Get Wrong

This is where most chasen damage actually happens, not during whisking itself.

Only dip the prongs in water when cleaning, not the entire chasen. Never let it sit submerged for more than about a minute. Prolonged soaking is the fastest way to damage bamboo, since the tines absorb water unevenly and lose their spring, and the woven thread at the base of the tines can loosen over time if it stays wet.

Rinse quickly under water immediately after use to clear out any residual matcha, then dry it properly. This means face down on a stand or holder, tines pointing toward the ground, in an open area with airflow. Do not dry it tines up, and do not store it inside its original protective case. The case is for shipping, not for daily storage. A chasen left in its case while still damp is one of the most common ways people end up with mold on the tines.

Where to Keep It

Somewhere with stable humidity, not directly beside a window, an oven, or an air conditioning vent. Bamboo reacts to swings in humidity by cracking, usually along the handle first. A small crack in the handle itself is common with regular use and is not necessarily a sign the whisk is finished, the woven thread wrapped around the base prevents most handle cracks from spreading further into the tines.

When to Replace It

There is no fixed lifespan, it depends entirely on frequency of use and how carefully it is cared for. What to watch for:

Tines that stay bent or splayed even after drying, rather than springing back into shape.

Multiple broken or missing tines, which reduces how evenly it can aerate the matcha.

A handle crack that has visibly spread past the woven thread base.

A chasen used daily in a home kitchen with proper care can last many months. One used constantly across a busy cafe bar will wear faster and is worth treating as a consumable that gets replaced on a routine, not just when it visibly fails mid service.

Our chasen is built specifically with cafe use in mind, with a prong count designed to whisk matcha to a clump free, consistent texture whether you are whisking to order or prepping in batches.

Caring for Your Aluminium Tin

The pouch your matcha ships in is built to keep it fresh for regular, frequent use. A tin solves a different problem: what happens when you are not drinking matcha every single day, and the bag needs to stay sealed and protected for longer stretches between uses.

Before First Fill

Make sure the tin is completely dry inside before adding any powder. Even a small amount of residual moisture from washing will affect matcha almost immediately, causing clumping and accelerating spoilage. If you have just washed it, let it air dry fully, ideally overnight, rather than wiping it and filling it right away.

Filling and Sealing

Fill it in a dry environment, not right after boiling water for your own cup or in a steamy kitchen. Matcha is highly reactive to ambient moisture in the air, and filling a tin in a humid kitchen can introduce moisture before the lid is even closed.

Once filled, make sure the screw top seal is fully closed, not just resting shut. The seal is what actually blocks oxygen and light from reaching the powder, a loosely closed tin offers barely more protection than the original pouch.

Cleaning Between Refills

If you are switching between matcha and hojicha in the same tin, or simply refilling after finishing a batch, wash it with warm water only. Avoid strong scented detergents. Aluminium and matcha are both absorbent of surrounding smells, and a tin washed with a heavily fragranced soap can pass that scent directly into your next batch of tea.

Where to Keep It

Cool, dark, and dry, away from the stove, the kettle, and any window that gets direct sun. A sealed tin protects the powder from air exposure far better than an open pouch, but it does not protect it from heat. A tin left on a sunny windowsill will still degrade its contents faster than one kept in a cupboard, sealed lid or not.

Tin vs Pouch: When to Use Which

If you are working through your matcha within a few weeks, the original pouch is fine on its own, reseal it properly after each use and keep it away from heat and light. A tin becomes genuinely useful once you are not moving through the powder quickly, for an occasional drinker, for gifting, or for keeping a small working portion on the counter while the main stock stays sealed elsewhere. We cover the broader logic of splitting bulk stock from daily use stock in our matcha storage guide for cafes, and the same principle applies at home just at a smaller scale.

Our aluminium storage tin holds up to 30g, enough for a full pouch of either our OG Matcha or Uji Hojicha, with a screw top seal built to keep light and air out between uses.

A Simple Routine

If you want the short version to actually stick:

Chasen: dip prongs only, never the handle. Rinse right after use. Dry face down on a stand, never in the case. Keep it somewhere with stable humidity.

Tin: make sure it is bone dry before filling. Fill somewhere dry, not a steamy kitchen. Close the seal properly, not just rested shut. Keep it cool, dark, and away from direct sun.

Neither of these takes more than a few extra seconds once it becomes habit, and both are the difference between a bowl of matcha that tastes the way it was meant to and one that has quietly lost most of what made it worth buying in the first place.