They change colour depending on the ambient lighting. The above pen looks to be in very bright sunlight, evident by the long shadows. Possibly one of the longest running production colours if not the longest with Black Sea Gloss.
I clean with intermittent ultrasonics in conjunction with warm water flushing with a jumbo syringe, then LP airline to remove most of the water, then allow to dry. I don't think you want it too dry otherwise you may end up with the poor ink flow which some Carene users experience. The feed is a BIG, complex, boy in these pens.
Thanks for the pictures of the stripped down Carene. It is a stunning looking pen, with a pretty complicated looking feed collector! Question: What's that gunk under the hood? (I'm not alluding to a car problem, obviously!) It looks like some form of adhesive. Is it?
Having purchased just yesterday a vintage 1948 Parker "51" FP-and-pencil set, I'm wondering if I should disassemble the FP to inspect the collector for gunk. I flushed the pen quite thoroughly with water until the water ran clear, but I have this nagging suspicion the collector is less than immaculate. The nib seems to be a fine, and while I'm not used to writing with a fine nib, the ink delivery seems a bit dry. Could a gunked up collector be part of the problem?
There are several videos by Grandmia on U-tube at www.youtube.com/watch?v=FCBsMGnhaGQ about how to disassemble, clean, and reassemble a Parker "51" but I'm leery about heating the area where the hood attaches to the barrel, which is something you need to do, according to the narrator of the videos. Oh, I forgot: I did try--very gingerly--to separate the tines on the nib a little bit, but the ink flow didn't improve. Do you think I should just soak the feed/hood for a couple days?
You seem to be quite handy with pen maintenance, so thanks in advance for any advice you care to give. Don
"He is no fool who gives what he cannot keep to gain what he cannot lose." (Jim Elliot, Christian martyr)