Does the pen tip turn color after the first several uses? Mine went from yellow to purple.

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.

can this be used on fabrics?

Sorry, it cannot. It only can be sued on paper or paperboard products. Thank you.

Would this work to test stickers?

I haven't tried it specifically on stickers, but it has worked on all the various surfaces I have tested so far.

Will this work on black paper

I'm not sure that it would, but I haven't specifically tried it on black paper.

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Lineco pH Testing Pen for Paper or Paperboard Products. by Lineco

Lineco pH Testing Pen for Paper or Paperboard Products. by Lineco

Product ID: 806453749

Details

Brand
Lineco
Number of Items
1
UPC
099295003506

📏Precise acidity measurement

🟣Color change at pH 6.8+

🖊️Instant pH detection

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€ 28.89

Duties & taxes included

In stock

Sold byAmazon IrelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖊️ Protect your paper legacy with a single stroke!

COMPACT PORTABLE - Sleek pen design fits in your toolkit or pocket for on-the-go testing.
INSTANT P H READINGS - Draw a quick line and get immediate acidity results—no waiting, no fuss.
SIMPLE ONE STEP USE - Just draw a line—no complicated setup or calibration needed.
VISUAL COLOR INDICATOR - Pen tip turns purple at pH 6.8 or above for easy, unmistakable readings.
ACCURATE ACIDITY DETECTION - Detects if paper or board is acidic, protecting your valuable documents and projects.

The Lineco pH Testing Pen offers a fast, reliable way to determine the acidity of paper and paperboard products. With a simple line-drawing method, it instantly changes color to purple when the pH is 6.8 or higher, helping professionals and hobbyists safeguard their archival materials and creative projects from acid damage.

Specifications

ASIN	B000KNJCSS
Amazon Bestseller	#570,859 in Electronics ( See Top 100 in Electronics ) #386 in Two-Way Radio Batteries
Brand Name	Lineco
Customer Reviews	4.4 4.4 out of 5 stars (192)
Item Weight	0.01 Kilograms
Model Number	L533-0023
Part Number	L533-0023
UPC	099295003506 099295530811

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TrustScore 4.5 | 7,300+ reviews

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Fantastic experience overall. Will recommend to friends and family.

1 month ago

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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