After loosing all my fountain pens in Brazil - and throwing away all the old ones from when I was a child - I went out and bought new ones *sigh*. I got a coral Lamy and a Noodler's flex. The lamp was sketched with the Lamy with Noodler's grey ink - this is as much detail as I can squeeze in an object. My hand was sketched with the Noodler's with J Herbin brown ink. No idea why I bought this ink I do not like it one bit, it does not even look like brown. I might try mixing it with Noodler's. One of the sketchers in Brazil uses a mix of waterproof and non-waterproof ink in his pens. When a wash is applied, the line is still maintained.