Hi, A supplier in Japan shipped me my Sailor Profit 21k fine rhodium with only its usual cartridges instead of adding in the purchased converter (which is now on its way). What type of ink is usually in these cartridges please - non-water resistant or a water resistant nano-type pigment like their blue-black? Their English wasn't too understandable to me when discussing the converter so I didn't want to ask them in case confusion occurred. I intend to use Iro inks once the converter arrives so didn't want any unusual gunking in the pen if the inks are incompatible and I'd missed cleaning a tiny bit of the cartridge ink out. It's a pen I've wanted for some time so don't want to mess it up. I usually only use water for cleaning, so if there is a home made pen flush that will do the job of cleaning out Sailor's nano ink I'd be keen to know which recipe here on FPN might be best please (I have it in a dedicated Pilot that is coming up for its first clean anyway). Thanks.