I don't know much about pastel pencils--so there could be something like a mechanical pastel pencil out there, and if so, hopefully someone will answer this question with information about such a pencil.
But, I have a hunch that they don't exist because of the different composition of the "lead" in a pastel pencil vs. that in a mechanical pencil.
I have ...
Once you've finished your work, if you need to protect it from being smudged, use Fixative Spray that is made for specifically this purpose. Hairspray will also work in a pinch.
Only do this once you're finished though - since it will make it near impossible to add more chalk once it's done. If you need to transport unfinished work, do so in a tight folder, ...
You will see a dulling or muting of the colors if you use fixative, which is why many pastel artists will actually “fix” in stages. Personally I like to build up muted color layers and use my highlights and whites on the top.
No matter what, you should always apply multiple light layers of fixative, letting them dry in between stages.
Hair spray is good in ...
Here are some additional recipes to complement fixer1234's extensive answer:
The easiest and most likely candidate for a homemade fixative is milk.
Van Gogh protected a lot of his drawings using regular milk (and water)1 - at times pouring out entire glasses over them. The reason he opted for milk was because he wanted to get rid of the sheen of charcoal ...
I would lean toward using acid-free tissue paper. It comes in all sizes and you can cut out sheets large enough to separate your drawings. I think this is similar to what my sisters use.
Of course one of the things that could help preserve them is spray a fixative on them, to help keep them from smudging.
Last if you need a physical container, there are ...
Use a spray fixative such as this one to fix the pastel etc. to the page. This way, the artwork stays on the paper, leaving you to put anything you wish on top.
A cheaper alternative that some say works is to use hairspray.
I agree with @magerber. There are a couple reasons why.
1: It's soft. Having it in such a small diameter would most likely break it.
2:You want a wider tip for coloring areas like that. Have you ever tried doing any piece of art with just a mechanical pencil? It takes forever, and the shading is difficult.
3: If you made a piece that was wide enough, the ...
You use a drawing board. When I was in high school we used these for our drawings and paintings all the time whether using an easel or sitting at a table. It allows you to easily move the paper around without touching it as much and gives you something to hold onto. I remember we taped the paper down to the board to keep it in place.
Here's an example of a ...
It will be easier for people to offer relevant answers if we know your constraints; what you want to avoid. I would think lots of clear spray finishes could work in a pinch (hair spray, clear paint-type finishes like lacquer, etc.; and spray application would avoid smudging). If it's a question of cost, it's just another art supply to protect your effort. ...
I'm not sure why it is lightening: is the paper showing? Does the paper have enough 'tooth' or grip to begin with? How hard are you pressing into the paper and pastel? I've found gentle pressure with fingertip is enough. With softer (more expensive pastels) they tend to be the easiest to blend. If you have not tried a high-quality pastel like Schminke, then ...
No fixative will make pastels totally sealed and irremovable, at least not without totally changing the look of the pastels (typically darkening and dulling them). So it is a balance between protection and look. Fixing will make the under layers workable, strong enough to take layers above without too much mixing, but a pastel drawing will always be fragile.
I don't do any work with pastels, but my friend does. I asked her what a good one would be, and she said that the Sennelier fixative works pretty well. It's a final fixative, and it gives a matte finish as well. It works best if you use a few thin coats, drying in between. It's about $16, which is the cheapest one, but it's also really good. Good luck with ...
About a quarter to a third of the pastel colours visibly change when exposed to natural light for a period of several months.
Among pastels (of any brand), reds and pinks seem to suffer the most from light.
In reaction to a test (referenced in this answer), NuPastel removed the 17 least lightfast colours from their product range somewhere in or before ...
My life-long spouse has had great experience with this medium. When queried, she said hair spray is far less expensive than the commercial solutions. It's probably a good idea to test the stuff on a scrap first.
I would look into a mixture of gum arabic dissolved in buttermilk, chalk whiting, a bit of almond oil and your marble dust, add your pigment and a drop of clove oil to keep the organic from going off.
500g gum arabic
250g - 500g chalk
250g - 500g marble dust
2-5g almond oil
Bring buttermilk in a pot to about 80 degrees ...
Perhaps you could make your own version by mixing up a ground that you could paint onto less expensive paper. I am pretty sure Golden makes things that you can mix into their acrylic mediums to add tooth to the surface. If you build up a thick enough base you could hand sand that surface to get the different grades that Uart provides.
It would be tricky to ...
Separate the works with a spacer (an art-class classmate built a box
using corflute with a set of vertical 10mm balsa spacers in the
corners with rounded tops to keep them separate and help guide the works in.)
Don't drive long distances over long bumpy roads (a friend did that
and her landscape pastels were ruined.)
Comment above about hairspray not being ...
Pastels, that is chalk pastels, are easy and beautiful media for blending or creating translucent effects like smoke, as you know. However, they are fragile and will blow away or fall off if not sealed. Even then they will be sensitive to the environment, especially fingers.
That said, I'd bet you would be successful with a semi-permanent spray fixative. ...