This is how I paint traditional purity seals with a vibrant red wax and beige parchment.
Parchment and Text
Basecoat the paper with Rakarth Flesh .
Wash with Agrax Earthshade . Try not to let is pool in unsightly places.
Reestablish the Rakarth Flesh in places where ligh would hit.
Add a chunky highlights with Rakarth Flesh and Pallid Wych Flesh mixed 1:1.
Add fine highlights of pure Pallid Wych Flesh .
Add some white to the previous mix and pop spot highlights this on corners/points.
Mix Abaddon Black and Rhinox Hide 1:1 then paint in the text with a very fine brush. I find the best way is to randomly paint in dots and dashes in lines, moving my hand along slowly. Do a secondarky pass refining for the best results.
Red Wax Seal
Basecoat with Khorne Red .
Paint everything but recesses with Mephiston Red .
Paint two thirds of the raised areas with Evil Sunz Scarlet .
Cover an even smaller area with Wild Rider Red .
Add specular highlights of Lugganath Orange to corners and strategically within the last highlight.