Sign In
  • UD Search
Toggle Navigation

Open the Navigation Management window, which can be used to view the full current branch of the menu tree, and edit it.

CONNECT
  • Facebook

MITRA Forum Question Details

Image Picker for Section 0

 ForumQuestion

  • 20 Year Old Pastel SticksApproveRejectUn-ApproveSubscribeUn-Unsubscribe
    Question asked 2016-11-21 13:34:07 ... Most recent comment 2016-11-21 13:35:00
    Pastel
    Question
    20 year old pastel sticks Question: I have a fantastic collection of fine pastel sticks. From Schminke to Rembrant, to Windsor Newton, etc. Perhaps 1000. I had to stop using pastel due to living in very hot climates year round and limited interior work space/health. I am now ready to take pastel painting up again, and find that many sticks are pretty chalky and or dry. Is there any safe way to revive them? Thank you very much.
Answers and Comments
  • EditDeleteModerator AnswerInteresting....in our experience pastels do not change much at all over the years. In fact many high quality pastels are dried in ovens during the preparation process. Is it possible that certain colors have been "chalky and/or dry" since the start? We are not aware of any way to "revive" pastels but we will ask some pastel experts on our forum to weigh in on this subject.
    Kristin deGhetaldi (CAS)
    2016-11-21 13:43:34
  • ApproveRejectUn-ApproveUser CommentWondering if living in a very hot climate, as you noted, as well as assuming low humidity, has impacted the feel of the pastels by pulling out any of the normally retained moisture from the clays and chalks that are integral to pastel formulations. Not to mention the clay component of such pigments as ochres. All those materials are hygroscopic and would readily absorb moisture until reaching equilibrium with the relative humidity of the environment. I would imagine, in that scenario, a chalk pastel in a higher humidity could have a smoother, creamier feel - versus a drier, scratchy one in low humidity. If this is the culprit, you might try storing them in a space where you can control the humidity and keep it within a range of 40-60%? Keep in mind this is my own speculation only and as Kristin states, pastel experts might be able to add to the insights and causes.

    Sarah Sands
    Senior Technical Specialist
    Golden Artist Colors
    2016-11-21 14:47:23
  • ApproveRejectUn-ApproveUser Comment20 years isn't that old. I have many 45-50 years old and they are still in great shape. Perhaps since yours absorbed so much moisture as they were in a humid climate, the binder may have migrated to the surface and got blotted out, weakening the pastel.Pigment would not change, but let's say a mold or fungus entered the humid pastel it might appear chalky.
    2016-11-21 15:03:29
  • ApproveRejectUn-ApproveUser CommentThey traveled with me from humid Central America, extremely humid and hot Asia the extremely dry and hot Middle East and then on to extremely hot and often humid East and West Africa. Sorry for my poorly written question. Some of them are rather dry (actually the softer pastels). Thank you.
    2016-11-21 22:32:12
  • EditDeleteModerator AnswerAh ok....sounds as if you have gotten some good mileage out of them then...I agree with Sarah that you might consider trying to store them in something akin to a humidor of sorts. If they are kept in a well sealed container/storage unit already try placing a small shallow dish of water inside and leave it for a while (do not place the water in direct contact with the pastels). This may or may not help....unfortunately you might have to look into purchasing a couple new colors here and there if they prove to friable to work with.
    Kristin deGhetaldi (CAS)
    2016-11-22 02:52:15
  • ApproveRejectUn-ApproveUser CommentThank you all. Very helpful and will try to rehumidify them (not a real word). The thought about mold sounds very possible. That too I will check out.
    2016-11-22 20:26:30
  • ApproveRejectUn-ApproveUser CommentWith that many pastels you have a pretty valuable stock. I have ground up old broken pastels before, adding distilled water until it forms a smooth paste, then shaped them into sticks which were left out to dry fully. As long as you don't mix hard pastel sticks with soft pastels in the "re-manufacturing" process, they work quite well. You might try doing that with a few of the worst case sticks. If you want to harden the final stick you can add varied amounts of binders such as clay.

    I wear nytrile gloves during the process and just roll them in my palms to the desired thickness. You can then use some parchment paper or waxed paper to make them square if you want by flattening the rolled sticks with a piece of board on either side of the waxed paper. Reminiscent of working with Play Dough as a kid.

    You will run into issues if you mix hard sand soft sticks - there will be harder chunks mixed in with the softer matrix.

    2016-11-24 12:22:12
  • ApproveRejectUn-ApproveUser CommentAfter my last comment about grinding them with water to rework the sticks, I realized that nowhere in any of the posts was it stated, nor was the question asked - if they are oil pastels or regular hard / soft pastels. I assumed they were regular chalk type pastels not oil pastels with my response.
    2016-11-24 12:26:23
Page Settings and MetaData:
(Not Shown on the Page)
Page Settings
question
No
MetaData for Search Engine Optimization
MITRA Forum Question Details
restricted
This page cannot be accessed until you accept the Terms of Use, which can be found here.
Please note that this Terms of Use system uses cookies. If you have cookies disabled you will not be able to accept the agreement. If you delete our cookies you will need to re-accept the Terms of Use.
  • The Department of Art Conservation
  • 303 Old College
  • University of Delaware
  • Newark, DE 19716, USA
  • Phone: 302-831-3489
  • art-conservation@udel.edu