Odp: Question regarding TLC plates for dye identification

[Pawe³ Karaszkiewicz <zekarasz@xxxxxxxxxxxxx>]

Susan,
Try Merck (Darmstad, Germany) for both: plates and Uranyl Acetate. In fact I
have some spare U.A but since it is slightly radioactive,  I cannot send it
by post.
By the way - I am greatly interested in your project. In nearest future I
plan to start a similar one concerning European reds. Could you send me more
details - perhaps off the list if you wish.

Best

Pawel
Dr. Pawel Karaszkiewicz
Academy of Fine Arts,
Faculty of Art Conservation and Restoration
ul. Smolensk 9, 31-108 Krakow, Poland

e-mail: zekarasz@xxxxxxxxxxxxx

----- Original Message -----
From: Susan Heald <healds@xxxxxxxxxxxxxx>
To: <texcons@xxxxxxxxxxxx>
Sent: Monday, July 23, 2001 9:47 PM
Subject: Question regarding TLC plates for dye identification


> Hi there,
> We are working on a project and are primarily interested in identifying
insect red dyes. Apparently, Schleicher and Schuell, the company whose
polyamide TLC plates Dr. Schweppe recommended for identifying natural dyes,
is no longer making or distributing this type of TLC plate.   We did find
polyamide 6 TLC plates on a polyester support made by Macherey-Nagel and
distributed by Alltech Associates Inc.  When we opened the box, we found
that the polyamide coating was flaking off around the edges. In fact, the
coating was so fragile, it was nearly impossible to cut the plates. There
was poor separation and the coating developed craqueleur during drying. We
have also seen old Macherey-Nagel plates that have a craqueleur.
>
> Has anyone experienced this problems with polyamide coated plates? Does
anyone have alternatives to the Macherey-Nagel plates?
>
> Also - we are having difficulty finding a supplier for Uranyl Acetate. We
have looked at the following companies: Fisher, Alltech, Acros, Thomas, and
Cole-Parmer. Does anyone know where we could find it or have suggestions for
an alternative developing chemical?
>
> Susan Heald, Textile Conservator
> Dominique Cocuzza, Mellon Fellow in Textile Conservation
> National Museum of the American Indian
> Cultural Resources Center
> 4220 Silver Hill Road
> Suitland, MD 20746
> (301)238-6624 ext 6317
> healds@xxxxxxxxxxxxxx