PIXMA iP4600 - - Colour - Ink-Jet InkJet Photo Printer: ink absorber is full...

You need to replace the ink absorber and reset the error code by following the reset procedure:
Resetting error 6c10

You need to clean out the ink absorber before reseeting the printer, you are looking at an aprox. 75% strip of your printer, the absorber sits at the bottom right had corner of the machine and it is a long drawn out procedure.
There are instructions for replacing and cleaning ink absorbers on You Tube and also instructions for resetting the printer. It is too involved and lengthy to try repeat here. Try looking at:-

http://www.youtube.com/watch?v=VVpjqBr7KjUYou

THERE IS A SIMPLE SOLUTION TO THIS PROBLEM ...

I used some of the "Cartridge Flush" solution ... I squeezed some onto the waste ink absorber pads (Black & Colour), using my ink refill needle, and then I used soem paper towels to soak it up from the ink absorber pads.

NO MORE MESSAGES!

... hope it works for you as it worked for me!

Just follow these steps to fix this,

1. Start with printer off
2. Press and hold resume Button (triangle in the circle) and click “Power” button. green led should be on
3. While holding the Power button, release the Resume Button.
4. Without releasing the Power Button, click “Resume” button for two times and release Both Buttons.
5. Click “Resume” for four times then soon click “Power” button, to confirm the selected action (reset counter absorber).
6. Turn off the printer and turn on again

Reset Printer Canon ink obsereber

1. Start with printer off
2. Press and hold resume Button (triangle in the circle) and click “Power” button. green led should be on
3. While holding the Power button, release the Resume Button.
4. Without releasing the Power Button, click “Resume” button for two times and release Both Buttons.
5. Click “Resume” for four times then soon click “Power” button, to confirm the selected action (reset counter absorber).
6. Turn off the printer and turn on again

if the printer shows ink absorber full on display you have to firsst physically acess the ink absorber pad then clean it up by removing the excesses ink from the pad ,follow the step below to do this
STEP 1:
- Disconnect printer from AC power supply

STEP 2:
- Press and HOLD the POWER button, and connect printer to AC power
Power up with the cover open until the head moves to the left side then disconnect the power cord so that the head is positioned away from the pads. raise The two pads easily with a pair of sharp tweezers and the rinse in running water. it will become white again and can be blotted with paper napkins then air dried in a warm location(may be in an oven) . cleaned the wells in the rubber holdet with cotton swabs before returning the two pads

Its full ? Have you see the ink absorbers (in the bottom of the machine?)

If the ink absorbers are ok, then you have to reset the ink count.

Ink tank
replacement
When an ink tank becomes empty. ("No ink error"
displayed on the monitor or on the machine LCD, or
short flashing of an ink tank LED)
reset butten 1 min.

Inkjet printers have a fibrous pad inside them that collects the waste ink from cleaning the print head. Over time, this pad fills up with ink and can no longer hold any more. When this occurs, the printer indicates a "waste ink tank full" error.

Replacing the waste ink absorption pads is something an authorized canon service facility can take care of for you. Once they are replaced, it'll be functional again.

my printer say, "the ink absorber is full".