Rohrer&Klingner Ink sketchINK,Thea' 50ml

This works well and operates well from a fountain pen which means that sketches can take place at any moment.

My favourite ink for sketching, either with a fountain pen or brush. Waterproof once dry.

Nice ink to write with however this is not waterproof. I left it ten minutes but it still ran when I used a damp brush on it with both water and watercolour paint. I shook the ink before use as advised, and used it on watercolour paper, but even though it seemed dry it just dissolved when liquid was added. No idea why but I will be returning it.

I was hoping for a grey ink, which is what the description says. However if you look at the picture, it depends on the time of day, or the weather of something else as to what colour I get. All this scribbles were done in the space of 5 minutes with this ink. First time I used it, it seemed more brown so I used something else. Grabbed it today and tried on test bit, and the grey was perfectly grey. Then used it on my sketch and it turned brown again (which is not good news for my drawing). So I tried it on the scrap and this time it was brown. I have shaken the bottle, stirred it, spent ages trying to make sure it is mixed well, but it tends to be more donkey brown than the grey I thought it was.

I love the colour and it flows well. Do not leave it in a pen that is not in use for a period of time or it may clog the nib.

Keeps drying out in my fountain pen, which I guess can be a thing with waterproof inks, but I Iove the look of it so much that I went and bought a glass pen.

Bargain price, waterproof, nice shade of grey