Digital BW, The Print

Hi,
I'm expecting my first UT carts to run out of ink sometime soon and wondered - is it necessary to refill every chamber of the colour cart, or if it's ok to just refill the colour that runs out?

I am aware that taking out a cart and putting it back can cause loss of prime, so I expect the answer to my first question is that you have to refill every chamber.

Which brings me to my second question: is there any reason why one could not put the remaining ink in the non-empty chambers back in the bottle to be reused?

thanks,
Richard
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