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Q: I have an amazing carbon steel knife that is badly tarnished & a shows minor rust. Will this product help with tarnishing? Or just rust?

I use it to clean my sharpening stones. Metal is left on the stone in the form of a black liquid. To clean your knife I would use WD40 and xxx steel wool. Carbon knives get a patina over time which is normal. This actually protects the blade to some extent. Red rust is bad and should be removed by the method I mentioned above. For just the patina or tarnish you mention you can clean the surface with a green scotch bright pad which is finer then the other colors. 1x Rust eraser is not very course and should not damage your knife. Use light strokes and keep the pad wet.

Q: I just got 2 used ceramic whetstones at a thrift store that have little wear but both have rust on one side of them. will rust remover work on stones?

These rust erasers are actually made to remove surface rust from knives. They will work to clean the surface of soft waterstones, and the higher the grit, the better they work. They're almost useless on really hard ceramics (Spyderco stones), or on really coarse stones. I own one and regularly use it to clean steel particulate from Shapton Glass, Naniwa Super Stones, and a few others.

Q: Can i use this on my diamond stones

Yes you can, but its gonna wear your eraser out quickly. Soap and water and maybe a scrub brush is a better idea.

Q: when should this item be replaced? how long will it probably last?

It all depends on how much you use it. I removed a moderate amount of rust from two Japanese carbon steel blades and it is hard to tell whether I used 1% or 2% of this eraser.

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🧼 Rust-free knives, zero hassle—clean like a pro!

PRECISION SIZE - Compact 1.5"x2.5"x0.5" fits knife blades perfectly
QUICK SOAK CLEAN - Just 10 minutes in cold water to activate power
GENTLE YET EFFECTIVE - Medium grit scrubs rust without damaging your blades
LIGHTWEIGHT PORTABLE - Only 30g—carry it anywhere for on-the-go maintenance
EFFORTLESS RUST REMOVAL - Say goodbye to tough rust without scrubbing pain

The Kuniyoshi Chukyokenma M Rust Eraser is a compact, medium-grit rust remover designed specifically for knives. Simply soak it in cold water for 10 minutes, then gently scrub away rust without damaging your blades. Lightweight and easy to handle, it offers a pain-free, efficient solution to keep your knives pristine.

Have a Question? See What Others Asked

I have an amazing carbon steel knife that is badly tarnished & a shows minor rust. Will this product help with tarnishing? Or just rust?

I just got 2 used ceramic whetstones at a thrift store that have little wear but both have rust on one side of them. will rust remover work on stones?

Can i use this on my diamond stones

when should this item be replaced? how long will it probably last?

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Manufacturer	CKK
Brand	Kuniyoshi
Model number	#NA
Product Dimensions	3.81 x 6.35 x 1.27 cm; 30 g
Color	Black
Shape	rectangular
Material Type	Plastic
Manufacturer Part Number	#NA
Item Weight	30 g

Kuniyoshi Chukyokenma, M Rust Eraser, Sabitoru

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