Does the "good" Amber mark fade or is it permanent? Thanks for your help.

You put a small "x" on the bill with the pen. If the "x" is a golden yellow color it is authentic and the "x" should fade. If it's counterfeit the "x" will stay black..hope that helps.

can this pen detect a foreign country currency

You didn’t say what country. I believe foreign currency banknotes (cash) are not all the same, so that would be a fat no.

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🕵️‍♂️ Spot fakes before they fool you—because your hustle deserves real cash.

UV CAP SECURITY - Protect your pen and add a layer of counterfeit detection with the built-in UV cap.
COMPACT LIGHTWEIGHT - Slim 8x1.65x19 cm design weighing just 13.6g—perfect for on-the-go professionals.
PROUDLY MADE IN THE USA - Support domestic manufacturing with a trusted, original product.
INSTANT AUTHENTICITY CHECK - Mark bills and get immediate verification with chemically sensitive ink.
UNIVERSAL CURRENCY COMPATIBILITY - Works flawlessly on all U.S. currency designs from 1959 onward.

The Dri Mark Counterfeit Detector Pen uses a chemically sensitive ink that instantly reveals counterfeit U.S. bills by marking them amber for authentic and dark for suspect. Featuring a UV cap for added security and compatibility with all U.S. currency designs since 1959, this lightweight, compact pen is proudly made in the USA and trusted by professionals to safeguard their cash flow.

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Brand	Dri Mark
Model Number	DRI351B1
Colour	Black
Product Dimensions	8 x 1.65 x 19.05 cm; 13.61 g
Item Weight	13.6 g

Dri Mark Counterfeit Detector Pen with UV Cap, Black

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