will it work on glass liquor bottle?

Yes, but recommend our blue or red color. They stick to glass better than the yellow. please allow 5-10 mins for the ink to fully dry after application.

Will it write completely invisible on the face of a playing card?

Works best on porous surfaces. A very faint outline might be visible on a smooth glossy playing card.

So when you first wrote on paper did you have to wait until it dried to be completely invisible or right out the gate it was invisible?

Yes - It's best if you wait, but it doesn't take long. The ink definitely shows up better once it is dry. Sometimes it's visible after it dries, depending on whether you use cardstock or regular paper. Regardless, it is one of the better pens that I've found to use.

Will the ink wash out of sheets if laundered in bleach and industrial strength chemicals? Hotel sheets, per se?

It will not. This is security ink and is formulated to stick and be very tough to remove. Sorry

Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, Yellow

Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker, Yellow

Product ID: 379937308

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Details

Brand
Opticz
Ink Colour
Yellow
Number of Items
1
Point Type
Fine
Recommended Uses For Product
Uv

🌟Bright yellow glow under UV blacklight

🖊️2x ink volume for extended use

🛡️Safe, non-toxic & skin-friendly formula

Description

🕶️ Glow Undercover: Mark Your World in Invisible Brilliance!

SAFE FOR ALL AGES USES - Non-toxic, skin-safe ink designed for professional and creative applications without compromise.
FAST DRYING SEMI PERMANENT - Quick-dry formula ensures your markings stay put without smudging or easy removal.
VERSATILE SURFACE COMPATIBILITY - Works flawlessly on metal, glass, plastic, paper, and even skin—ideal for security, art, and inventory control.
DOUBLE THE INK DOUBLE THE IMPACT - Extra-large body with broad tip holds twice the ink of standard markers for longer, bolder markings.
INVISIBLE BY DAY GLOWING BY NIGHT - Stealthy yellow ink only visible under UV blacklight—perfect for secret codes and exclusive events.

The Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker in yellow features a semi-permanent, fast-drying ink that remains invisible in normal light but glows bright yellow under UV blacklight. With twice the ink volume and a broad tip, it’s designed for large, bold markings on diverse surfaces including skin, metal, glass, and plastic. Non-toxic and safe for all ages, this marker is perfect for security marking, event tickets, inventory control, and creative body art, making it a must-have tool for professionals and trendsetters who want to stay ahead in stealth and style.

Specifications

ASIN	B07H2SHN76
Age Range Description	All ages
Best Sellers Rank	#33,720 in Office Products ( See Top 100 in Office Products ) #334 in Permanent Markers & Marker Pens
Body Shape	Round
Brand	Opticz
Brand Name	Opticz
Colour	Yellow
Country of Origin	USA
Customer Reviews	4.3 out of 5 stars 590 Reviews
Hand Orientation	Ambidextrous
Included Components	1 x Opticz UV Blacklight Reactive Large Tip Invisible Ink Marker (Yellow)
Ink Base	Hybrid
Ink Colour	Yellow
Is Waterproof	false
Item Dimensions	12.7 x 1.5 x 1.5 Centimeters
Line Size	1.0_1.9mm
Manufacturer	opticz
Manufacturer Part Number	IIMARKERXLYOP
Marker Type	Permanent Marker
Material Type	Plastic
Model number	IIMARKERXLYOP
Number Of Items	1
Number of Items	1
Number of Pieces	1
Pattern	Letter Print
Point Type	Fine
Recommended Uses For Product	Uv
Special Features	glows bright yellow in blacklight, Non Toxic, Quick-Drying Ink
Style Name	Chisel
Surface Recommendation	Cardboard, Glass, Plastic, Wood
Target Audience	Adult, Kid
Theme	Security and Invisibility
UPC	744271613469
Unit Count	1.0 Count
Water Resistance Level	Water Resistant
Writing Instrument Form	Marker Pen

Reviews

A**R

Nice and bright

28.04.2025

D**L

Great for Geocaches

1.06.2025

S**T

It works

1.03.2026

R**R

Not totally invisible.

26.08.2022

O**Y

Works Great With UV!

25.03.2025

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