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Today I'm reviewing Cult Pens Deep Dark Blue ink. Cult Pens Deep Dark Blue is one of the 6 inks in the “Deep Dark” range that are made for Cult Pens by Diamine Inks. Deep Dark Blue is a very saturated ink that can show a little shading with finer nibs, and some great red sheen. I found it flowed very well with all of the pens I tried it in, felt quite wet, and it’s lubrication was really smooth across the page. It’s a really deep, dark blue and lives up to it’s name very well. It’s darker than all of my dark blue comparison inks, only Diamine 1864 Blue-Black was darker. I predict that this ink will darken even more, if you keep your pens filled with it for a while. My review was written on 100gsm smooth coated paper, that is not absorbent, and I saw no spread or show-through. I saw some nice red sheen though. The lines were crisp, but it took longer to dry on this coated surface than on some of the other papers I tried it on. On Field Notes paper it didn’t spread or feather. Writing on the reverse side of all of the papers I used would be acceptable as show-through doesn't look as bad on paper than when it is scanned and shown on screen. It's not sold as a waterproof ink but showed some water resistance. It stained my hands, particularly near to my fingernails. It took me several washes with bar soap and a couple of days before my hands were clean again. It didn’t stain my pens or the insides of my converters that I rinsed out with warm water as usual. Flow Rate: Excellent - quite wetLubrication: Very good - felt smooth across the pageNib Dry-out: Not noticed.Start-up: Immediate.Saturation: Very saturatedShading Potential: Some shading seen with F nib.Sheen: Fabulous red sheen on Tomoe River paper. Check it out on Seven Seas & Hobonichi papers even with this scanned image.Show-Through:Oxford paperSilvine NotebookCiaK by InTempoField NotesHobonichi Techo paper.Tomoe River 52gsm paperSpread / Feathering / Woolly Line: Not seen on any paper I used, even Field NotesNib Creep / “Crud”: Not seen, even after several days in the penStaining (pen): Not seen after several days - easy clean-upStaining (hands): This is a hand stainer. Use bar soap for several washes or Lava soapClogging: Not seen.Water resistance: Not sold as waterproof, but shows some water resistance.Availability: Available in 80ml and 30ml bottles plus International sized cartridges from Cult Pens web-site.