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, stand out sharper.

RETRACTABLE CONVENIENCE - No cap, no hassle—quickly ready your pen and stay productive on the go.
VIBRANT 10 COLOR PALETTE - Express your creativity or organize your work with a spectrum of bold, fade-resistant inks.
SLEEK PROFESSIONAL DESIGN - Minimalist, modern look that complements your executive style and workspace.
PINPOINT PRECISION WRITING - Ultra micro 0.28mm tip delivers crisp, clean lines for flawless notes and sketches.
COMFORT GRIP FOR LONG SESSIONS - Ergonomic rubber grip ensures fatigue-free writing during marathon meetings or brainstorming.

The uni-ball Signo RT1 is a premium retractable gel pen featuring an ultra micro 0.28mm tip for precise writing, a comfortable rubber grip for extended use, and a vibrant 10-color set perfect for professionals who demand both style and functionality in their everyday writing tools.

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Manufacturer	Uni-ball
Brand	Uni-Ball
Item Weight	3.7 ounces
Product Dimensions	5.55 x 4.33 x 0.79 inches
Item model number	SG_B01N6ZE42N_US
Is Discontinued By Manufacturer	No
Color	Black,Blue,Green,Orange,Violet
Closure	Retractable
Grip Type	Rubber
Material Type	Rubber
Number of Items	10
Size	1 Count (Pack of 10)
Point Type	Ultra Micro
Line Size	0_3mm
Ink Color	Black,Blue,Orange,Pink,Red
Manufacturer Part Number	UMN15528.10C

uni-ballSigno RT1 Retractable Gel Ink Pen, Ultra Micro Point 0.28mm, Rubber Grip, UMN-155-28, 10 Color Value Set

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