This site offers the ink in "small bottles of red or white or black"
_http://www.conservationresources.com/Main/section_24/section24_03.htm_ 
(http://www.conservationresources.com/Main/section_24/section24_03.htm) 
 
Found by a web search using the terms
buy Rotring white ink
 
The company has a USA and a UK catalog online

 
Best wishes, Barbara Hass, retired  librarian



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