This is my second Diamine vs Montblanc, and I have to say Montblanc is seriously disappointing. For the price, I would expect SIGNIFICANTLY different colors. These two are so similar I can’t help but wonder if UNICEF blue is just rebottled Aqua Blue.
The Inks
Diamine Aqua Blue
Price: ~$15 USD
Bottle Size: 80ml
Price Per Ml: $0.19
Availability: Readily available
Montblanc UNICEF Blue
Price: ~$40 USD
Bottle Size: 50ml
Price Per Ml: $0.80
Availability: Discontinued
Price: ~$15 USD
Bottle Size: 80ml
Price Per Ml: $0.19
Availability: Readily available
Montblanc UNICEF Blue
Price: ~$40 USD
Bottle Size: 50ml
Price Per Ml: $0.80
Availability: Discontinued
If you have any suggestions for future comparisons, let me know in the comments. And check out my other Ink Dupes posts.

I’m surprised Montblanc came out so poorly here, especially at that price point. Did you notice any feathering or bleed-through differences between the two, or was it mainly the color shift that disappointed you?
What disappointed me is that the two inks are virtually identical despite the difference in price.