The commonly method to add ink for HP printer ink cartridges

Firstly， Let us check the cartridge ink model in advance. As we all know different model representative different color.
Let talk the fill ink method for HP_27_28_56_57_58_59_816_817.
No. 27 Black Ink Cartridge (HP C8727A)
No. 28 Color Ink Cartridge (HP C8728A)
56 Black Ink Cartridge (HP C6656A)
57 Color Ink Cartridge (HP C6657A)
58 photo cartridges (HP C6658A)
59 photo cartridges (HP C6659A)
816 Black Ink Cartridge (HP C8816A)
817 Color Ink Cartridge (HP C8817A)
The last letter of the cartridge model only identifies the capacity
Black ink cartridge filling ink method: (27,56,816)
1, put the label off that on the top of the cartridge, Under the label and we will see the five holes;
2, the needle into one of the small holes for fill ink, pay attention to the capacity.
3, clean the hole around and paste the label.
If the cartridge is damaged, we can browse the website and choose the good quality with nice price cartridge and those cartridge ink can add ink so many time also.V4ink brand is a good choice and the HP CF400X/201X Compatible Toner Cartridge - 1 Pack, Black is a good type black cartridge. 
Color ink cartridge filling method: (28,57,817)
1, put the label off that on the top of the cartridge, Under the label and we will see the five holes;
2, to distinguish the color, there is a hole for the red, two holes for the blue, two holes for the yellow;
3,under the nozzle should put a paper and this is to prevent ink get out from the nozzle to string color,
If it is a slight string of color, we can make more than a few blocks to resolved this problem.
4,the needle into one of the small holes for fill ink, pay attention to the capacity.
5, clean the hole around and paste the label.
The V4ink HP CB540A CB541A CB542A CB543A (125A) Compatible Toner Cartridge - 4 Packs price is $53. 68 with four color ( Black, 1 Cyan, 1 Yellow, 1 Magenta).
Precautions:
28,57,817 three color ink cartridges contained in the primary colors: green (sky blue), goods (purple), yellow (Ming Huang);
58 photo ink cartridges contained in the primary colors: light green, light goods, black;
59 black photo ink cartridges contain the primary colors: light gray, dark gray and black.
58,59 cartridge filling method is same like 28,57,817, pay attention to distinguish the color, it is best to use a clean toothpick into the air to detect its color.