Non Tagged Ink Cartridges

[Yankle]

When browsing for ink cartridges so many show the term "non tagged" - can anyone explain what this actually means.
I have been buying compatible inks without seeing this phrase but now all providers seem to be showing this.
Any guidance will be appreciated.

Yankle

[1ozzy]

http://computertypes.proboards.com/thread/5657/untagged-cartridges-refilling

This next link explains "RGB"

http://www.earthboundlight.com/phototips/untagged-rgb.html


So a "non tagged" cartridge may not comply 100% to the colours inside.