Overview Reviews Product Description Derwent Lightfast PNC Tin72 are formulated to be 100% Lightfast meaning that the core is resistant to colour change for up to 100 years under museum conditions. Product Videos Custom Field Product Reviews (No reviews yet) Write a Review Write a Review × Derwent Derwent Lightfast PNC Tin72 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments