I just replaced my ink cartridges for my Epson Workforce 600 printer and the magenta and yellow colors do not print. The status shows that both are still full of ink, but when I do the nozzle check, nothing of those colors prints.

printer mixes colors to get final color. So if it prints Magenta then it may be missing Blue or Cyan. Try printing a blue color or a Cyan.
Suggest forcing printer to do a deep clean if ink tanks are full.

"Open the Applications folder, open the EPSON Printer Utility3, select WF 600 Series, and click OK. Then select Head Cleaning. 3. Follow the on-screen instructions to start the cleaning cycle, which lasts around 2 1/2 minutes."

from
https://files.support.epson.com/htmldocs/wf600_/wf600_00ug/WF600.1.158.html

Are they originals or replacement/refills?

It appears that some ink nozzles are blocked or not seated properly.

Go to the Epson support site below and enter Epson WorkForce 600 as your model. Then go to Troubleshooting Guide in the list on the right of the web page
Welcome to Epson Support

There isn't much to go wrong in a printer. If you've had the cartridge for a couple of months, I would venture a guess that you ran out of "Yellow" ink. One other possibility if that the wrong driver is installed for your printer (if this is a recent purchase) and that the driver being used is pulling Magenta instead of Yellow.

With epsom ink jet printers the printhead is on the machine, not he cartridge as with many printers. This complicates things!
I suggest you get some cleaner cartridges put them in and run one single cleaning cycle each day until the cartridge is finished. Remember just One cleaning each day,,, this is to allow time for the cleaner to sit and "possibly" dissolve the blockage.
It is about your only chance of salvage.
An Ink jet printers worst enemy is sitting for long periods of time without printing on a regular basis, The ink dries in the print head nozzle!

my printer is not priting right . it prints a fade shade the colors are blurr

did u peel off the plastic tape that covers the tiny hole on the ink cartridge. jackie

Your WorkForce 600 Series and its software will let you know when an ink cartridge is low or expended. If an ink cartridge is low, you see a message on theWorkForce 600 Series LCD screen. You can continue to print until a cartridge needs replacement. If an ink cartridge is expended, you see a message on the WorkForce 600 Series LCD screen. You must replace the cartridge to be able to print. Note:
You cannot print or copy when an ink cartridge is expended even if the other cartridges are not expended. Replace any expended cartridges before printing or copying. When an installed ink cartridge is more than six months old, you may need to replace it if your printouts do not look their best, even after cleaning and aligning the print head. Follow the instructions in these sections to check and replace your ink cartridges:

My printer quit printing blue after I cleaned the print heads. What can I do? I tried recharging the cyan cartridge and cleaning the print heads again. it's still not working! GRR!!

Hi there. The reason for your problem is that the colour cartridge contains cyan, magenta and yellow ink, plus a black cartridge of course. All the other myriad colours are produced by mixing these four basic colours. So, if you print red, it requires ink from both the magenta and yellow cartridges. Thus if your red produces a yellow print, it means your magenta is not printing. This can be due to a number of reasons, mainly an empty or faulty magenta cartridge or blocked magenta print nozzles.

If you wish me to help you with sorting out the lack of magenta, please post a new comment to this effect.