# burn · FT4 Rell API · Chromia Docs (concept)

> function burn(account: account , asset: asset , amount: big_ integer) Deletes tokens from an account's balance, decreasing the total supply by the amount
b

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.assets.Unsafe/burn/

FUNCTION

# burn

```signature
function burn(account: account, asset: asset, amount: big_integer)
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/assets/asset.rell#lines-556)

Deletes tokens from an account's balance, decreasing the total supply by the amount
being burned. It's marked as Unsafe, as it doesn't check who is authorizing the
burning, meaning any user could burn tokens from any account if this was exposed.

The functionality of `burn` can be expanded by using `before_burn` and `after_burn`

Throws if the required assets cannot be burned. Common cases include:

* the amount to burn is not in the accepted range (0; 2^256) (exclusive)
* some conditions added in development through burn extensions (`before_burn` or
  `after_burn`) aren't met
* the account balance is lower than `amount`

Throws `"UNAUTHORIZED BURNING"` if the asset's issuing blockchain is not this blockchain

Throws `"INSUFFICIENT BALANCE"` if the account does not have enough of the asset to
burn

Can only be called from an operation.

**Parameters**

* **account** — the account to remove tokens from
* **asset** — the asset to burn
* **amount** — the amount of tokens to burn

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.core.assets.Unsafe/burn.html)Generated API reference, mirrored from the live docs