Beige marble between sinks in a bathroom has been stained, apparently
by the blue-green ink on a toothpaste box set down in some water.  No
amount of scrubbing with water and a cloth has removed the stain from
the tiny whorles and curlicues in the marble. Would like to know what
kind of cleaner and procedure would remove the stain.

Hi corbett11,

Thank you for your question.  

The product you want to buy is from Stone Care International - IPP Stain Remover? 

Stonecare.com
http://www.stonecare.com/shop/flypage/e4a78e3c8ee8b3ffd0a0e282a74f36b3/57

TELEPHONE: 1-800-839-1654 
FAX: 1-800-SCI-6646  

"Stone Care poultice powders are designed to reabsorb ink stains out
of all natural stone surfaces including granite, marble, limestone,
slate, travertine, terra cotta, soapstone, flag stone and concrete. It
even absorbs mold and mildew stains out of grout. Stone Care?s line of
stain removers consist of oil stain removers, mold stain removers,
mildew stain removers, ink stain removers, and food stain removers.

Part I: General

1.01 DESCRIPTION:

These extra absorbent poultice powders are designed to reabsorb
stubborn stains out of stone that cannot be removed with liquid
cleaners. There are five ready to use formulas. Each formula is
designed to remove a specific stain: Rust, oil, food, mildew, and
ink."

A minimum purchase of $50.00 is required for the Free Shipping Special.   
 
1 Pint     $19.83      
2 Gallons  $65.24   

[read all information and directions on the page.]  

About 1/4 down the page you'll see 2 red links for a demonstration video: 

-  Residential Care Product Demonstration
-  Commerical Care Product Demonstration
(Requires RealPlayer)   
 
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DoItYourself.com Community Forums > Household and Cleaning > Cleaning
& Stain Removal   stains on marble
http://forum.doityourself.com/archive/index.php/t-137839.html
 
"For stains in natural stone, they require a poultice. My favorite
website for natural stone products and care and maintenance issues and
problem solving is www.stonecare.com. Once stains are removed, marble
should be sealed. You should use products recommended for natural
stone, nothing else as you can damage your marble."

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keyword search:

marble natural stone ink stain removal
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Good luck!
tlspiegel

Just what I needed. Thank you.