# Dyes (UN2801, UN3147) — Postal shipping restrictions by item category

For Dyes (UN2801, UN3147), carrier is USPS; restriction type is restricted; scope is domestic mail via air or surface transportation; conditions is Acceptable if dyes qualify as Limited Quantity air or surface; must follow Packaging Instruction 8A, recorded from its source on 2026-08-04.

- **Item category:** Dyes (UN2801, UN3147)
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** restricted _(our reading, not quoted from the source)_
- **Scope:** domestic mail via air or surface transportation _(our reading, not quoted from the source)_
- **Conditions:** Acceptable if dyes qualify as Limited Quantity air or surface; must follow Packaging Instruction 8A _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Dyes (UN2801, UN3147): Acceptable if the dyes qualify as Limited Quantity air or Limited Quantity surface material

## Source

- https://pe.usps.com/text/pub52/pub52c3_027.htm

Last verified: 2026-08-04. Review by: 2027-08-04.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).