---
type: guide
title: "What C1S Paper Is and Why One Side Stays Uncoated"
description: "C1S paper is coated on one face and bare on the other, so one side holds sharp colour and the other takes a pen, glue and a mailed address. C1S vs C2S, uses and limits."
resource: https://www.4over4.com/guide/what-is-c1s-paper
tags: ["guide"]
generated:
  by: "process:4over4-mapp-build"
  at: 2026-09-08T01:19:44.025Z
timestamp: 2026-09-08T01:19:44.025Z
sources:
  - resource: https://www.4over4.com/guide/what-is-c1s-paper
    title: "What C1S Paper Is and Why One Side Stays Uncoated"
status: stable
---

# What C1S Paper Is and Why One Side Stays Uncoated

C1S paper is coated on one face and bare on the other, so one side holds sharp colour and the other takes a pen, glue and a mailed address. C1S vs C2S, uses and limits.

See [all guide concepts](index.md).

- Page type: guide
- URL: https://www.4over4.com/guide/what-is-c1s-paper