Which pens do you use?

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Often I use a lot of scruffy-looking dip pens. Essentially each of these is a straight double-ended holder (a German make called Brausse) with a nib, which is flexible and scratchy, or a J nib, which is harder and broader. Or it may be some other kind of nib, such as a brand called 'Waverley', a favourite of mine, which is a very old-fashioned sort of nib that used to be used a lot by clerks;  they are quite hard to come by now, but luckily I laid in a good supply which will last me for years.  Or I might use a brush, or a reed pen, or a watercolour pencil, depending on the needs of the job.