You may want to try something more opaque like a marker, fine liner, smaller piece of charcoal, a 6B pencil, so forth. Something with more control and also applying it after everything has dried/making sure its not going to be moved around.
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You may want to try something more opaque like a marker, fine liner, smaller piece of charcoal, a 6B pencil, so forth. Something with more control and also applying it after everything has dried/making sure its not going to be moved around.