Last comparison. This is the same ink, from the same bottle (Diamine China Blue):

 

The one on the left is dry, but recently written. The one on the left has been sitting for 24 hours. Granted, the white balance is different in the two scans (no idea why, they were done back to back on the same settings) but trust me, the colour does change from a fairly bright true blue to a nice milky blue. Not great for writing notes as the contrast goes down, but looks pleasant nonetheless.