HP 364XL Black Ink Cartridge (550 Pages)

Title : HP 364XL Black Ink Cartridge (550 Pages)
ASIN : B004FRDBRS
Features :

• Type: Genuine/Original

List Price : £18.99
Price : £13.39
Saved Price : £5.60

category: Products
brand: Hewlett Packard
Item Page Detail URL : link
Rating : 3.9
Review : Could this be more confusing?
Well, after about 3 hours of trying to research which cartridge I should buy, (having read the reviews), I think I have finally got it.

There are 2 x Black 364XL cartridges and there are some unique differences. Don't be folled by the colour of the box as these do vary, however if you follow the steps below you should find the correct "XL" cartridge.

Part Number CB321EE: This cartridge is normal black. It looks thicker than the lower capacity black cartridge and is also thicker than the XL photo black. It also has a solid black "Pentagon" printed above the number. For my own printer, which is a B109n model, this is the correct one and looking above the slot where the cartidge fits into my printer, there is also a solid Black Pentagon. Also for reference, my own printer does not take seperate black cartridges for both photo and normal printing, ie, there is only a single slot for black.

Part Number CB322EE: This cartridge is for Photo Printing. Is is a...