---
product_id: 1601133
title: "Lineco pH Testing Pen for Paper or Paperboard Products."
brand: "lineco"
price: "¥2465"
currency: JPY
in_stock: true
reviews_count: 13
category: "Lineco"
url: https://www.desertcart.jp/products/1601133-lineco-ph-testing-pen-for-paper-or-paperboard-products
store_origin: JP
region: Japan
---

# Precise paper testing Instant pH color change Made in USA quality Lineco pH Testing Pen for Paper or Paperboard Products.

**Brand:** lineco
**Price:** ¥2465
**Availability:** ✅ In Stock

## Summary

> 🖋️ Swipe Smart, Archive Forever!

## Quick Answers

- **What is this?** Lineco pH Testing Pen for Paper or Paperboard Products. by lineco
- **How much does it cost?** ¥2465 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/1601133-lineco-ph-testing-pen-for-paper-or-paperboard-products)

## Best For

- lineco enthusiasts

## Why This Product

- Trusted lineco brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Clear Acid Warning:** Yellow or clear line instantly flags acidic paper that risks yellowing and brittleness.
- • **Instant pH Detection:** Swipe once, see purple for archival-safe paper in seconds.
- • **Effortless & Portable:** Compact pen design for quick testing anywhere—no lab needed.
- • **Trusted Archival Brand:** Lineco’s USA-made pen ensures reliable, professional-grade results.
- • **Preserve Your Paper Legacy:** Identify alkaline paper (pH ≥ 6.5) to protect journals, art, and documents from aging.

## Overview

The Lineco pH Testing Pen is a precision tool designed to instantly reveal the acidity or alkalinity of paper and paperboard products. Made in the USA by a trusted archival brand, it uses a chlorophenol red indicator that turns purple on papers with a pH of 6.5 or higher, signaling archival quality. Ideal for artists, archivists, and professionals, this pen helps ensure your paper goods resist yellowing and deterioration, preserving your creative and professional legacy with a simple swipe.

## Description

Lineco pH testing pen is an easy, convenient test pen to distinguish between alkaline paper and board, and acidic paper and board. The chlorophenol red indicator solution turns a definite purple color on any paper with a pH of 6.5 or higher.

Review: Works the same regardless of the pen’s tip color - I really love this pen. I have all kinds of journals, sketchbooks, loose papers, and cardstock that I enjoy using for journaling and this pen is a fantastic tool to check anything that isn’t labeled as acid-free or that one isn’t completely sure about. A simple swipe of the pen on the paper will reveal whether it’s acidic or not - the line left on the page will instantly appear purple for an alkaline pH or, alternatively, instantly turn clear/transparent or yellow for an acidic pH. When it arrived, I spent a fun evening going through stacks of journals and paper and checking everything. My pen arrived with a solid purple tip (some seem to have light tips out of the package) but the marks it left behind on the pages changed color appropriately depending on the pH of the paper. I tested the pen on known (labelled as such) acid-free sketchbooks, journals, papers, and cardstock from The Paper Studio (Hobby Lobby), Peter Pauper Press, Recollections from Michael’s, and a few other random things and then to test for acidity I also tested the pen on some Moonster journals and old, yellowed (some nearly tan) notepads and notebooks that are definitely acidic and aging. The pen’s mark changed color appropriately - purple for everything labelled as acid-free: sketchbooks, The Paper Studio, Peter Pauper Press, and Recollections and then yellow or clear/transparent for old and yellowing notepads, notebooks, and Moonster - even though the tip of the pen itself was solid purple. I saw that some people were concerned about the color of the pen’s tip upon opening the pen for the first time, so whether the tip on your pen is purple or light when it arrives it’ll work the same regardless. An essential tool to keep on hand for anyone with an eye towards acid-free and archival-quality materials!
Review: This really works on watercolor paper (I tested on acid paper, too) - I occasionally run across a new brand of watercolor or mixed media where the listing says it's acid-free, but the pad doesn't say anything about it. I wondered if there was a way to test the paper that didn't involve grinding it up and putting it in Ph neutral water, and in my searches, someone on a forum recommended this, the Lineco pH Testing Pen for Paper or Paperboard Products.. I ordered one immediately. When I opened it up, there was a label firmly stuck over the part that tells what color to look for, so I came back to the listing and noticed a reviewer said this was just a purple marker. So I did a test. I used the marker on 3 pads of watercolor paper. All three showed a purple mark, which is the sign the paper is Ph neutral. Then I took one of those sheets of paper and gently applied lemon juice across the surface. When it dried, I tried the maker on it - and got a clear line, which means the paper is "unsuitable" or acidic. So yes, this pen does work. It works if you want to test your paper for Ph to make sure it won't yellow, become brittle or cause ink, watercolors or pencil to fade over time. Good news for me is that the very nice paper I got recently that didn't say it was acid-free on the pad got a purple mark from the test pen. One of the older pads that claimed in the listing to be acid-free but not on the pad ended up with a clear mark. Super product.

## Features

- Basic Info: Material created and made in USA. Lineco is a leading and trusted brand for archival art, photography, and framing supplies
- Quick reflection: Shows within seconds if your paper products are archival. Clear or yellow line means bad - Purple line means archival
- Storage condition: Paper can be reasonably long-lived if its pH is 6.0 or higher, especially if it is well made and carefully used and stored. In order to last for centuries in today's polluted air, it must have an alkaline reserve and this usually means a pH of 7.0 or greater
- Easy to use: Simply draw a small line on the material you wish to test. The line drawn will turn purple on most papers if there is an indication of pH neutrality
- Please note: This is a pH indicator only. Unreliable results may occur on colored, coated, or unbuffered materials

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000KNJCSS |
| Best Sellers Rank | #49,345 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #387 in Drawing Pens |
| Date First Available | June 17, 2003 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.317 ounces |
| Item model number | L533-0023 |
| Manufacturer | Lineco |

## Product Details

- **Brand:** Lineco
- **Manufacturer:** Lineco
- **Ph Range:** 6.8 and above
- **UPC:** 099295003506 099295530811
- **Unit Count:** 1.0 Count

## Images

![Lineco pH Testing Pen for Paper or Paperboard Products. - Image 1](https://m.media-amazon.com/images/I/61FB-6FHRgL.jpg)
![Lineco pH Testing Pen for Paper or Paperboard Products. - Image 2](https://m.media-amazon.com/images/I/61Rd8hx8mhL.jpg)
![Lineco pH Testing Pen for Paper or Paperboard Products. - Image 3](https://m.media-amazon.com/images/I/51+Pd8aFZjL.jpg)
![Lineco pH Testing Pen for Paper or Paperboard Products. - Image 4](https://m.media-amazon.com/images/I/71VgyrK4J+L.jpg)
![Lineco pH Testing Pen for Paper or Paperboard Products. - Image 5](https://m.media-amazon.com/images/I/61eLKDfTXkL.jpg)

## Questions & Answers

**Q: Does the pen tip turn color after the first several uses? Mine went from yellow to purple.**
A: Mine's half of the tip turned from orange into purple the first time I used it. Some say it will fade back over time while others say it's permanent. I don't know about validity of readings but I suppose they should still be consistent.

**Q: can this be used on fabrics?**
A: Sorry, it cannot. It only can be sued on paper or paperboard products. Thank you.

**Q: Would this work to test stickers?**
A: I haven't tried it specifically on stickers, but it has worked on all the various surfaces I have tested so far.

**Q: Will this work on black paper**
A: I'm not sure that it would, but I haven't specifically tried it on black paper.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works the same regardless of the pen’s tip color
*by A***R on July 25, 2025*

I really love this pen. I have all kinds of journals, sketchbooks, loose papers, and cardstock that I enjoy using for journaling and this pen is a fantastic tool to check anything that isn’t labeled as acid-free or that one isn’t completely sure about. A simple swipe of the pen on the paper will reveal whether it’s acidic or not - the line left on the page will instantly appear purple for an alkaline pH or, alternatively, instantly turn clear/transparent or yellow for an acidic pH. When it arrived, I spent a fun evening going through stacks of journals and paper and checking everything. My pen arrived with a solid purple tip (some seem to have light tips out of the package) but the marks it left behind on the pages changed color appropriately depending on the pH of the paper. I tested the pen on known (labelled as such) acid-free sketchbooks, journals, papers, and cardstock from The Paper Studio (Hobby Lobby), Peter Pauper Press, Recollections from Michael’s, and a few other random things and then to test for acidity I also tested the pen on some Moonster journals and old, yellowed (some nearly tan) notepads and notebooks that are definitely acidic and aging. The pen’s mark changed color appropriately - purple for everything labelled as acid-free: sketchbooks, The Paper Studio, Peter Pauper Press, and Recollections and then yellow or clear/transparent for old and yellowing notepads, notebooks, and Moonster - even though the tip of the pen itself was solid purple. I saw that some people were concerned about the color of the pen’s tip upon opening the pen for the first time, so whether the tip on your pen is purple or light when it arrives it’ll work the same regardless. An essential tool to keep on hand for anyone with an eye towards acid-free and archival-quality materials!

### ⭐⭐⭐⭐⭐ This really works on watercolor paper (I tested on acid paper, too)
*by P***E on March 18, 2025*

I occasionally run across a new brand of watercolor or mixed media where the listing says it's acid-free, but the pad doesn't say anything about it. I wondered if there was a way to test the paper that didn't involve grinding it up and putting it in Ph neutral water, and in my searches, someone on a forum recommended this, the Lineco pH Testing Pen for Paper or Paperboard Products.. I ordered one immediately. When I opened it up, there was a label firmly stuck over the part that tells what color to look for, so I came back to the listing and noticed a reviewer said this was just a purple marker. So I did a test. I used the marker on 3 pads of watercolor paper. All three showed a purple mark, which is the sign the paper is Ph neutral. Then I took one of those sheets of paper and gently applied lemon juice across the surface. When it dried, I tried the maker on it - and got a clear line, which means the paper is "unsuitable" or acidic. So yes, this pen does work. It works if you want to test your paper for Ph to make sure it won't yellow, become brittle or cause ink, watercolors or pencil to fade over time. Good news for me is that the very nice paper I got recently that didn't say it was acid-free on the pad got a purple mark from the test pen. One of the older pads that claimed in the listing to be acid-free but not on the pad ended up with a clear mark. Super product.

### ⭐⭐⭐⭐⭐ Good for old photo albums
*by M***U on November 3, 2025*

I did not know this existed. I have old photo albums that I needed to know if the ph was off.

## Frequently Bought Together

- Lineco pH Testing Pen for Paper or Paperboard Products.
- LINECO Neutral pH Adhesive 8 Oz, Acid-Free, All-purpose Glue, Dries Clear and Remains Flexible. Used for Bookbinding and Book Repair, Framing, Collages, Paper Art and Crafts

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-26*