Do these bleed through on Bible pages?

I don't know the answer to that, but I wouldn't even TRY them in my bible (and I'm a Bible journaler!). I use prismacolor colored pencils in all my Bibles.

Where can I buy refills for this pen?

You should be able to purchase refills here on Amazon

Can you right on a rock with these?

I have not tried to do so, and I really doubt that fine of tip would work very well. I guess I would experiment to see if you could. They do make pens especially for writing and painting on rock. I would recommend that type of pen, but try these to see.

Has anyone colored with these?

My uni ball Signo RT1 collection of color gel pens are of 0.28 mm fineness. They are very very fine point. At such fine point, I think you can only write with it. I think it will be hard to color anything with it.

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🖋️ Write Sharp, Live Bold – The Pen That Means Business

COLOR YOUR WORLD - Set of 10 vivid, fade-resistant gel ink colors to elevate your documents and unleash your creativity.
COMPACT POWERHOUSE - Lightweight and ergonomically designed for all-day comfort, making it your ultimate desk companion.
SMOOTH GLIDE NO SMUDGE - Advanced gel ink formula ensures effortless writing with quick-dry, smudge-proof results every time.
ECO CONSCIOUS CONVENIENCE - Retractable design reduces waste and keeps your pen protected, perfect for the mindful professional on the go.
PRECISION IN EVERY STROKE - Ultra Micro Point 0.28mm tip delivers razor-sharp, professional lines for flawless note-taking and creative work.

The UNI-BALL SIGNO RT1 Gel Pen Value Set features ultra-fine 0.28mm micro tips and a spectrum of 10 vibrant gel ink colors. Designed with a smooth, quick-drying ink formula and an eco-friendly retractable mechanism, this set combines precision, style, and sustainability for professionals who demand excellence in every line.

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Brand	uni-ball
Model Number	SG_B01N6ZE42N_US
Color	medium
Material Type	Rubber
Size	1 Count (Pack of 10)
Point Type	medium, micro
Line Size	0_3mm
Ink Color	Black, Blue, Orange, Pink, Red
Included Components	Ink Cartridge
Product Dimensions	14.1 x 11 x 2.01 cm; 105 g
Shredded Shape	Erasable, Retractable
Application type	Uni Signo RT1 UMN 155 28 Gel Ink Pens 10 Color 0.28mm Mitsubishi Uniball pen

UNI - BALL SIGNO rt1 Gel , Micro Point 0.28 MM, MICRO POINT 0.38 MM, Medium Point 0.5 MM, Value Set with ecology Ultra Micro Point (0.28mm)

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