What is the portrait supported on?

wooden panel
* oak

 

canvas
linen

 

paper
* wove
* cream wove
* heavy wove
* rough
* India

 

coloured paper

* grey/blue/cream paper

 

copper

 

parchment

 

vellum

 

ivory

 

board

 

playing card
>> National Portrait Gallery, Artists, their materials and suppliers (http://www.npg.org.uk/research/programmes/artists-their-materials-and-suppliers.php)