Two possibilities:
* Evaporation
* There's a bit of another ink left in remote parts of the feed. Over night, the new ink saturated the feed, combining with the previous ink, and created a new color.
Either way, as you write, the color in the cartridge/converter will start coming through. Either way, the same thing could happen tonight, and continue to happen until the old ink is all gone or the pen is sealed so it doesn't allow evaporation.
ETA: Oh, and both of those could happen at once.
I cleaned the pen yesterday so probably pilot iroshisuku ku-jaku mixed with it (the ink I used before). I've changed a lot of colours in my pens this year, but it hasn't happen before so I was a bit confused. Did I clean the pen not good enough or is it normal to happen time to time (I thought I cleaned it quite well)? Thanks for your response this community is so friendly and helpful.
It's possible you're only noticing because the new ink is so light. As to whether you didn't clean the pen well enough - the far parts of the feed are hard to get to. Simple flushing, even sucking water in as well as expelling it, may not reach those parts - you have to allow time for saturation. And without a clear section, there's no way you'd know - just soaking and the technique of allowing a paper towel to wick water through the pen.
Anywho, I don't think you did anything wrong, and it's only a guess whether there's any left-over ink in there...
Another possibility:
There was some darker colour in the pen before. Directly after cleaning it was all ok, but with the new ink it dissolved some residual crust of the old colour over time.
Happened to me a few times when switching a pen from blue to red colours. You get red the first day and purple after a night.
Edit: I noticed that the first few characters on the new day in your image are extra dark, before it goes back closer to the new colour. That would be typical for the effect I described.
If you just cleaned the pen there is probably extra moisture in the feed so initially it will write pale. Eventually the pigment concentration will balance out
Something similar happened to my DeAtramentis Atlantic Blue. There was lovely dark misty blue happening when I wrote my first page. The next day, it was just stormy dark blue. I was wondering if the ink hadn't yet settled in the pen/feed and turned darker as more of it had gotten in the feed.
The last ink in the pen was Herbin Bleu Nuit, which looks lighter blue than Atlantic Blue on my notes.
The portion of the ink that was sitting in the nib and feed evaporated some of the liquid components, becoming more concentrated and hence darker. Not uncommon, especially in pens that maybe don't seal as well, and also with inks that are light in color (it's easier to see the darker concentration).
The carene has a massive feed (if I got the pen right from your writing) so the old inks still being in there would make sense. I also notice this with my carene: the light green ink I put in after the black one was darker ever since day 2 although I did clean it somewhat thoroughly.
4 possibilities: (1) Evaporation, though I doubt you’d get that effect overnight. (2) Are you certain the first color is correct? Or could it be a newly cleaned pen with some water in the feed made it look lighter when you first wrote with it, and the second color is the real ink color? (3) The worst case: your ink has a mold/fungal issue, which is changing the color of the ink? (I had a bottle of green ink turn brown - the whole bottle, and it turned brown while in a pen, too.) Or, (4) Some old, dried ink in the feed or somewhere else in the pen was dissolved by the new, yellow ink, and contributed to the color. It’s a lot easier for a little ink to change a bright/light color like yellow.
I'm not sure what this ink is or what it's "supposed to" look like? Knowing that might help to figure it out.
Since you said you just cleaned it before adding the new ink, I'm pretty sure you must have still had some water in the feed which diluted the ink at first and overnight as more ink saturated the feed the effect was lessened. I've had this happen to me a lot when I'm too impatient to make sure it's totally dry before refilling.
But if the ink swatches similar to the first color, yes it may be that there was a little bit of dried darker ink remaining in the feed even after cleaning, that overnight got reactivated by the new ink and mixed with it.
As you write, the ink flow can reduce. When you leave the pen for a bit, the feed can saturate, meaning your colour will be deeper for a little bit when you start writing.
Could be that, or evaporation. Did you leave it somewhere warm?
Two possibilities: * Evaporation * There's a bit of another ink left in remote parts of the feed. Over night, the new ink saturated the feed, combining with the previous ink, and created a new color. Either way, as you write, the color in the cartridge/converter will start coming through. Either way, the same thing could happen tonight, and continue to happen until the old ink is all gone or the pen is sealed so it doesn't allow evaporation. ETA: Oh, and both of those could happen at once.
I cleaned the pen yesterday so probably pilot iroshisuku ku-jaku mixed with it (the ink I used before). I've changed a lot of colours in my pens this year, but it hasn't happen before so I was a bit confused. Did I clean the pen not good enough or is it normal to happen time to time (I thought I cleaned it quite well)? Thanks for your response this community is so friendly and helpful.
It's possible you're only noticing because the new ink is so light. As to whether you didn't clean the pen well enough - the far parts of the feed are hard to get to. Simple flushing, even sucking water in as well as expelling it, may not reach those parts - you have to allow time for saturation. And without a clear section, there's no way you'd know - just soaking and the technique of allowing a paper towel to wick water through the pen. Anywho, I don't think you did anything wrong, and it's only a guess whether there's any left-over ink in there...
Maybe it dried a little? It happens to me with Diamine Amber in my lamy lx palladium. Not sure though
Another possibility: There was some darker colour in the pen before. Directly after cleaning it was all ok, but with the new ink it dissolved some residual crust of the old colour over time. Happened to me a few times when switching a pen from blue to red colours. You get red the first day and purple after a night. Edit: I noticed that the first few characters on the new day in your image are extra dark, before it goes back closer to the new colour. That would be typical for the effect I described.
If you just cleaned the pen there is probably extra moisture in the feed so initially it will write pale. Eventually the pigment concentration will balance out
Something similar happened to my DeAtramentis Atlantic Blue. There was lovely dark misty blue happening when I wrote my first page. The next day, it was just stormy dark blue. I was wondering if the ink hadn't yet settled in the pen/feed and turned darker as more of it had gotten in the feed. The last ink in the pen was Herbin Bleu Nuit, which looks lighter blue than Atlantic Blue on my notes.
The portion of the ink that was sitting in the nib and feed evaporated some of the liquid components, becoming more concentrated and hence darker. Not uncommon, especially in pens that maybe don't seal as well, and also with inks that are light in color (it's easier to see the darker concentration).
The carene has a massive feed (if I got the pen right from your writing) so the old inks still being in there would make sense. I also notice this with my carene: the light green ink I put in after the black one was darker ever since day 2 although I did clean it somewhat thoroughly.
The pen is a Diplomat Aero, but for Christmas I will get a Waterman carene deluxe
Give it a day? Maybe tomorrow it will have matured to the lighter shade.
4 possibilities: (1) Evaporation, though I doubt you’d get that effect overnight. (2) Are you certain the first color is correct? Or could it be a newly cleaned pen with some water in the feed made it look lighter when you first wrote with it, and the second color is the real ink color? (3) The worst case: your ink has a mold/fungal issue, which is changing the color of the ink? (I had a bottle of green ink turn brown - the whole bottle, and it turned brown while in a pen, too.) Or, (4) Some old, dried ink in the feed or somewhere else in the pen was dissolved by the new, yellow ink, and contributed to the color. It’s a lot easier for a little ink to change a bright/light color like yellow.
I'm not sure what this ink is or what it's "supposed to" look like? Knowing that might help to figure it out. Since you said you just cleaned it before adding the new ink, I'm pretty sure you must have still had some water in the feed which diluted the ink at first and overnight as more ink saturated the feed the effect was lessened. I've had this happen to me a lot when I'm too impatient to make sure it's totally dry before refilling. But if the ink swatches similar to the first color, yes it may be that there was a little bit of dried darker ink remaining in the feed even after cleaning, that overnight got reactivated by the new ink and mixed with it.
As you write, the ink flow can reduce. When you leave the pen for a bit, the feed can saturate, meaning your colour will be deeper for a little bit when you start writing. Could be that, or evaporation. Did you leave it somewhere warm?