Some coloured pencils are water soluble - water can be brushed over them to blend colours. Water-soluble pencils are usually softer than ordinary coloured pencils and will go blunt more quickly.
For simplicity, I tend to use a #2 graphite pencil for most of my deep-sky drawings. After all, a pencil and paper are all that’s really needed to record an observation. Is a minimalist approach the ...
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