what colour gives you the most problems

[purpledragon]

ive had a few problems with my inks over the last few months and every time its been the cyan thats giving me hasstle. whilst messing about with an old cart assembly today i pulled a glup of cyan out the tube and this has me wondering is there an issue with cyan ink?
if you use a ciss system with artanium ink and when you have had any sort of problem with your ink or carts what colour have you had problems with ?
this could anything from bad nozzle checks causing the need for head cleans to complte failure resulting in new cart assemblies