It's likely that because the HP Officejet Pro 8500A e-All-in-One is a colour inkjet printer you'll need to have all four of the black, cyan, magenta and yellow ink cartridges installed with ink in each cartridge for the printer to work. Please refer to your printer manual for further information on specific settings and the configuration of the ink cartridges: https://support.hp.com/us-en/product/hp-officejet-pro-8500a-e-all-in-one-printer-series-a910/4083864/model/4083967/manuals

Every cartridge that we sell is fitted with the correct chip for your printer, whether genuine or compatible. We can't guarantee that compatible HP Officejet 8500A ink will have all the same properties as genuine HP ink which uses patented technology. However, our premium brand HP Officejet 8500A ink cartridges work in the same way and deliver a very similar level of print quality and performance. They also contain the same amount of ink in each cartridge as the genuine HP versions.

Yes, when you receive a VAT invoice from us the VAT number is at the bottom of the page.

I'm afraid we don't have any accessories for Continuous Ink Systems. This is a modification that is made to your printer by a third-party manufacturer and is not endorsed by the printer manufacturers themselves. We can't set up a Continuous Ink System for you or supply any of the accessories that you'll need. We can only supply you with the standard consumables for the HP Officejet Pro 8500A e-All-in-One printer such as genuine or compatible ink cartridges.

Unfortunately not, we don't supply any ink to be used as part of a Continuous Ink System. This type of system requires that your printer is modified and is not endorsed by the printer manufacturer. Although we sell compatible HP Officejet Pro 8500A e-All-in-One ink cartridges which are "aftermarket" cartridges, these aren't for use in a CIS ink system and we don't stock any cartridges that are.

Yes, all of the ink cartridges we sell, including the genuine and compatible HP Officejet Pro 8500A e-All-In-One ink cartridges, are fully chipped and are ready to install directly into your printer.

Thank you for your question.

The two sets of cartridges we have on offer for the HP Officejet Pro 8500A are a set of genuine HP inks and a set of compatible inks which are manufactured by a third party as a cheaper alternative to HP inks.
In terms of the cartridge setup, the printer takes four ink cartridges and two printhead units. The printheads are separate to the ink cartridges and come in a combined cartridge of black / yellow or cyan / magenta rather than the inks which come in black, cyan, magenta and yellow.
The printheads ensure that ink is transferred to your page accurately whereas the ink cartridge simply hold the ink reservoir although the two parts work alongside each other as the printer operates even though they must be replaced separately.