Would this be safe for granite tile provided that the tiles are sealed?

I used it on the grout between my granite tiles. The tiles aren't sealed. I reviewed it here: http://juliecache.com/2014/03/08/new-and-improved-backsplash-and-counter/.html The black color hasn't faded yet.

I have white grout now will this change the color to black? That's what I want to do

Yes. It is like paint so you'll want to be careful not to get the black on your tile.

Once applied, how do I keep tiles clean?

Clean the floor tiles the way you normally do. The grout stays black. Although. I probably wouldn't use a bleach based cleaner.

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✨ Elevate Your Grout Game! ✨

MOULD PREVENTION - Infused with anti-bacterial agents to keep mould at bay.
COMPACT CONVENIENT - Lightweight design for easy handling and storage.
TRANSFORM YOUR SPACE - Revitalize your tile grout with a sleek black finish!
LONG LASTING COVERAGE - Effortlessly covers up to 60 meters of grout lines.
VERSATILE APPLICATION - Perfect for both kitchen and bathroom floors & walls.

The Rainbow Chalk Markers Limited Grout Pen is a 7ml, water-based solution designed to restore and protect tile grout in kitchens and bathrooms. With a coverage of up to 60 meters, it features anti-bacterial properties to prevent mould growth, making it an essential tool for maintaining a clean and stylish home.

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€ 35.95

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Manufacturer	Rainbow Chalk Markers
Part number	GP81107
Item Weight	25 g
Product Dimensions	9.5 x 1.4 x 19 cm; 25 g
Item model number	GP81107
Size	7ml
Color	Black
Style	Compact
Material	Water Based
Item Package Quantity	1
Number Of Pieces	1
Special Features	Waterproof
Batteries Included?	No
Batteries Required?	No

Rainbow Chalk Markers Limited Grout Pen - Designed for restoring tile grout in bathrooms & kitchens (Black)

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