Koh-I-Noor limited edition ink

I have spotted on the Koh-I-Noor site that they have a new ink for sale.

It uses the same plastic 50 ml bottle as the standard one but it is about 5 times more expensive.

The name Koh I Noor is missing from the label, just Hardtmuth. I guess this is because it is a limited edition from the "HARDTMUTH collection".

Blue or black are the only available colors.
I didn't test it yet, I hope I will in the future, but I would like for Koh I Noor to make more colors at least for the "special collections". As their inks come in basic blue, black or red.

Sunday Sudoku

Like many others, I found myself with a lot more time on my hands. I have a long list of stuff I would like to do like learn to ride a skateboard, make a bonsai, pick up the guitar again, read 3 books, exercise and others. But for this Sunday I wanted to enjoy the hobby that made me create the blog. As I do not know how to draw and I am not that much into journaling I thought Sudoku is a great way to use my beloved pencils and erasers, exercise the brain and kill some time. All with one stone.
I think I overstretched downloading some "moderate" Sudoku. The first took me about 2 hours and the second more than 3, as I found a mistake almost at the end, which set me back a lot. I tried a 3rd moderate Sudoku but abandoned it after an hour and 3 numbers discovered.

Koh-I-Noor Mephisto Mechanical pencil 0.7 HB
Koh-I-Noor Hardtmuth eraser