Skip to Main Content
Sign In
Toggle Navigation

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

  • Instagram
  • Facebook

MITRA Forum Question Details

Image Picker for Section 0


  • Pyrrole RedApproveRejectUn-ApproveSubscribeUn-Unsubscribe
    Question asked 2019-08-06 10:12:52 ... Most recent comment 2019-08-06 19:06:25

    ​I'm working with a new pigment, Pyrrole Red PR 254.  It resists wetting, so I added a bit of alcohol to disperse and convert it to a paste.  Usually once a pigment has successulfy dispersed in water, and it dries out, adding more water readily rewets it.  However when the Pyrrole paste dried out, adding more water didn't reconvert it to a paste; I had to add more alcohol.  I'm interested in this, as well as any other comments on Pyrrole Red, which is new to me.

    Thanks, Koo Schadler

Answers and Comments

  • EditDeleteModerator Answer

    ​We have yet to do significant testing of diketo-pyrrolo-pyrrole (DPP) (PR 254) pigments, but in my research I noted that most acrylic dispersants do not disperse and stabilize this pigment effectively except for coppolymers modified with special aromatic acidic anchoring groups. This may be related to the effect you see of poor wetting by water.

    George O'Hanlon
    2019-08-06 19:06:25

Page Settings and MetaData:
(Not Shown on the Page)
Page Settings
MetaData for Search Engine Optimization
MITRA Forum Question Details
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