The following are highly recommended sources
for quality historic materials:

Pigments and raw materials:

Kremer Pigments 
www.kremerpigments.com

Natural pigments
www.naturalpigments.com

Studio Products
www.studioproducts.com

Sinopia pigments
www.sinopia.com


Parchment:

Henk de groot
historically produced parchment, full skins only.
www.dedas.com

Marjan Petac
www.naravno-usnje.com
Historically produced parchment
Rare and unusual varieties 

Talas
www.talas-nyc.com
Cut pieces available.