--- product_id: 74895050 title: "Lineco pH Testing Pen for Paper or Paperboard Products." brand: "lineco" price: "€ 25.17" currency: EUR in_stock: true reviews_count: 6 category: "Lineco" url: https://www.desertcart.pt/products/74895050-lineco-ph-testing-pen-for-paper-or-paperboard-products store_origin: PT region: Portugal --- # pH range 6.5-14 Results in seconds Precision pen applicator Lineco pH Testing Pen for Paper or Paperboard Products. **Brand:** lineco **Price:** € 25.17 **Availability:** ✅ In Stock ## Summary > 🖋️ Know your paper’s future—test pH fast, stay archival forever! ## Quick Answers - **What is this?** Lineco pH Testing Pen for Paper or Paperboard Products. by lineco - **How much does it cost?** € 25.17 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/74895050-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 - • **Precision Pen Design:** Easy, mess-free application with a sleek pen format for on-the-spot testing. - • **Wide pH Detection Range:** Accurately tests paper acidity from 6.5 to 14, ensuring archival quality. - • **FOMO-Proof Your Collection:** Don’t risk fading or brittleness—know your paper’s pH and keep your work timeless. - • **Instant Archival Verification:** Get clear pH results in seconds to protect your valuable paper goods. - • **Trusted by Creatives & Conservators:** Used by professionals to confirm acid-free status and prevent paper degradation. ## Overview The Lineco pH Testing Pen offers a quick, reliable way to determine the acidity of paper and paperboard products. With a simple pen applicator and a clear color-coded system, it reveals whether your paper is archival (purple line) or acidic (clear/yellow line) within seconds. Covering a pH range of 6.5 to 14, this tool is essential for artists, conservators, and professionals who demand longevity and quality in their paper materials. ## Description Product description Easy and quick to use;Shows within seconds if your paper products are archival;Clear or yellow line means bad - Purple line means archival Directions Instructions for using the pH Testing Pen for Paper or Cardboard: 1. Prepare the surface of the paper by cleaning it if necessary. 2. Hold the pH Testing Pen vertically on the surface of the paper. 3. Lightly press the button to apply the chlorophenol red indicator solution to the paper. 4. Wait a few seconds for the solution to react with the paper. 5. Interprets the results according to the color obtained: a light or yellow line means unarchived paper, while a purple line means archived paper. Review: Expensive but works - 12 quid for a pen - pfff. but it does the job 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 - Lineco pH Testing Pen for Paper or Paperboard Products. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000KNJCSS | | Best Sellers Rank | 433,322 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 17 in pH Meters | | Brand | Lineco | | Customer Reviews | 4.4 out of 5 stars 195 Reviews | | Item Weight | 0.01 Kilograms | | Manufacturer | Lineco | | Manufacturer Part Number | L533-0023 | | Model Number | L533-0023 | | Recommended Uses For Product | pH testing for paper products | | Recommended uses for product | pH testing for paper products | | Sterility Rating | 6.5-14 | | UPC | 099295003506 099295530811 | | Unit Count | 1.0 count | | Unit count | 1.0 count | | pH range | 6.5-14 | ## Product Details - **Brand:** Lineco - **Manufacturer:** Lineco - **Recommended uses for product:** pH testing for paper products - **Unit count:** 1.0 count - **pH range:** 6.5-14 ## 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 ### ⭐⭐⭐ Expensive but works *by V***N on 15 July 2023* 12 quid for a pen - pfff. but it does the job ### ⭐⭐⭐⭐⭐ This really works on watercolor paper (I tested on acid paper, too) *by P***E on 18 March 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. ### ⭐ Unrealiable *by A***R on 20 May 2026* Worthless. Everything gets purple. ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/74895050-lineco-ph-testing-pen-for-paper-or-paperboard-products](https://www.desertcart.pt/products/74895050-lineco-ph-testing-pen-for-paper-or-paperboard-products) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-06-21*