Thanks for starting the topic, Jim. As a writer, I have a jones for writing instruments. (IOn one job for Honda America, their factory was home to geese. I picked up about a dozen large wing feathers, but I have not cut any pens, yet: still reading how to do it and hesitant to try.) I have an array of colored pencils (Derwnts mostly). And I get coupons from a local art supply store. I could do more with this myself.
I have been keeping an Astronomy journal since September of 1965.
Yes, I have tried drawing doubles with pencils and I think I’m going to end up going back to doing it that way. LOL! But, I am always interested in suggestions. Jim
In my notebooks so far, I have only drawn in black and then noted the colors with verbal descriptions.
I have many like this. I note my telescope, oculars with or without 2x Barlow, time and date (of course). I have been trying to keep this to scale with the field-of-view, graph paper, and millimeter ruler. The stars, of course, do not come out to scale. But it is good enough for a representation.
I use colored pencils on white paper, and print the colors in inverse.
Preparing that, take all the color pencisl you intend to use, scan their streaks and invert it in the computer. Then easiest write the real color at the pencil.
There are a lot of sketches with this method in our double star observation list. Example:
I have no problem - and now some motivation - going to the art supply store and trying a full range of pencil brands. The barrier for me is that the colors of the stars as I perceive them are seldom as stunning as the pencils would portray. Albireo is famous as an exception. Mostly, I know that one star is yellow and another blue if they are close together for contrast. Otherwise, all stars are white, white-yellowish, white-orangish, white-blueish. I have tried Aldebaran and Antares and Mars: orange, maybe. To draw them ruby red, fire engine red, sunset red, etc. with pencils would be representational, at best.
I have an item on my blog, "Amateur Astrophotography is Baloney." I think that they are artists, not scientists. They make pretty pictures but deliver no repeatable data. So, drawing in color would present the same difficultly for me. However, in that context, I could accept drawings in color as valid reports not different in quality from just saying "orange."
Finally, in Burnham's Celestial Handbook you can find his histories of reports in which famous 19th century astronomers used descriptions like "pink" and "stunning green" and "pleasing lavender."