Kintsugi is often described as permanent. But that word covers a range of things — and the honest answer depends on what kind of kintsugi we are talking about.

Traditional honkintsugi (本金継ぎ), using genuine urushi lacquer, is extraordinarily durable. Modern kintsugi, using synthetic resins, is considerably less so. Here is what you actually need to know about both.

Table of Contents

1.  How durable is traditional honkintsugi?

2.  How durable is modern kintsugi?

3.  Is kintsugi food safe?

4.  How to care for a kintsugi piece

5.  Frequently Asked Questions

1. How durable is traditional honkintsugi?

Urushi (漆) — the lacquer at the heart of traditional kintsugi — is one of the most durable organic materials ever used by humans. It has been found on artefacts in Japan dating back 10,000 years, still intact. Once fully cured, it is resistant to water, mild acids and alkalis, and heat up to approximately 95°C. It does not yellow with age. It does not become brittle.

The interesting thing about urushi is that it does not just resist degradation — it continues to harden for decades after curing. Traditional craftspeople and lacquerware specialists often say that urushi does not reach its hardest and most stable state until it is well over a century old. A repair done today, under the right conditions and with the right care, is likely to be stronger in fifty years than it is now.

The gold lines themselves — applied as genuine maki-e powder (蒔絵粉) over the cured lacquer — do not fade or detach under normal use. The powder and lacquer form a unified surface. What you see the day a piece is completed is what you will see in twenty years, with the possible addition of the warm patina that aged lacquer develops over time.

2. How durable is modern kintsugi?

Modern kintsugi — the versions using epoxy resin or other synthetic adhesives, often mixed with gold-coloured mica powder — is a different story. Epoxy adhesives are genuinely strong when new. But they degrade. Most synthetic resins show meaningful weakening within 10 to 20 years, and they yellow as they age. The gold-coloured mica finish in most modern kintsugi kits is also not genuine gold — it will fade and dull over time in a way that real maki-e powder will not.

Modern kintsugi has its place — it is accessible, quick, and can produce something beautiful as a decorative object. But it is worth being clear that the durability claims made for traditional kintsugi do not apply to it. When people say kintsugi lasts for centuries, they mean honkintsugi. Not synthetic resin.

3. Is kintsugi food safe?

Traditional honkintsugi, using genuine urushi lacquer, is food safe — but only once the lacquer has fully cured. Raw urushi contains urushiol, the same compound responsible for poison ivy reactions, and should never come into contact with food or skin before it has hardened. After curing, it is entirely inert. Japanese lacquerware has been used as food and drink vessels for thousands of years.

The curing process takes time. Urushi cures through an enzymatic reaction that requires moisture and warmth — optimal conditions are 20–30°C and 70–85% humidity. Most repairs require multiple layers, each cured before the next is applied. A completed piece should rest for at least one month before being put into food use. After that, it is safe for normal tableware purposes.

What kintsugi cannot handle: microwaves, dishwashers, ovens, direct flame, prolonged soaking in water, and sudden temperature extremes. These are the same restrictions that apply to all traditional lacquerware. Boiling water is fine — urushi's heat resistance is approximately 95°C — but the kind of sustained heat a microwave delivers is not.

Modern kintsugi using synthetic resins is generally not food safe. If you are unsure about a piece, the seller should be able to confirm what materials were used and whether it is safe for food contact.

4. How to care for a kintsugi piece

Traditional honkintsugi pieces should be treated like lacquerware — which they are. The rules are simple:

Wash by hand, gently, with mild soap and warm water. No dishwashers — the heat and detergent will damage the lacquer over time.

No microwaves, ovens, or direct flame. The heat resistance limit is approximately 95°C.

Avoid prolonged soaking. Brief washing is fine; leaving a kintsugi piece submerged for hours is not.

Store carefully. Do not stack kintsugi pieces against each other — the gold lines can be scratched. Wrap or separate them.

Keep out of extended direct sunlight. Urushi lacquer can be affected by UV exposure over long periods.

With this level of care, a traditional honkintsugi piece will last — and improve — for generations. The repair will outlast the hands that made it.

Frequently Asked Questions

Q: Can I put a kintsugi piece in the dishwasher?

No. Dishwashers combine sustained heat, strong detergent, and physical movement — all of which are damaging to urushi lacquer. Hand-washing with mild soap is the right approach. The same rule applies to all traditional lacquerware.

Q: Can I use a kintsugi bowl for hot soup or tea?

Yes. Urushi lacquer is heat-resistant to approximately 95°C, which is sufficient for hot food and drinks at normal temperatures. The limit to observe is sustained heat — such as putting a kintsugi piece in a microwave or oven — rather than the temperature of ordinary hot food.

Q: How soon can I use a kintsugi piece after it is completed?

For pieces repaired using traditional urushi lacquer, it is generally recommended to wait at least one month after the final curing stage before putting the piece into food use. The lacquer continues to harden and stabilise during this period. Pieces from atelier_muho are fully cured before they are listed, so they are ready to use when you receive them — though we still recommend beginning gently.

Q: Will the gold rub off with regular use?

Genuine maki-e gold powder (蒔絵粉) applied over properly cured urushi does not rub off under normal handling and washing. The gold and lacquer form a unified surface. Over years of use, the surface may develop a soft patina — the characteristic warmth of aged lacquerware — which most owners find adds rather than detracts from the piece.

Q: What happens if a kintsugi repair breaks again?

A repair done in traditional urushi is stronger than most people expect — considerably stronger than the original ceramic in the area of the join. If a repaired piece does break again, it will typically break in a new place rather than along the old repair. If that happens, a skilled kintsugi practitioner can repair it again using the same methods.

All pieces at atelier_muho are repaired using traditional honkintsugi methods — genuine urushi lacquer throughout, and genuine gold powder at the final stage. Each piece is fully cured and food safe when it arrives.

Browse the current collection at shop.ateliermuho.com