Uni POSCA PC-17K water-based pigment ink marker. Writes on virtually any surface with no bleed through on paper. Acrylic chisel-shaped nib writes a 15mm line. POSCA works on most surfaces and is permanent on absorbent media such as paper and card, and can be removed from shiny surfaces with a scraper. To make permanent: Paper/Card: No action needed - POSCA pigment will be absorbed into the fibres, making it permanent. Terracotta: Bake in the oven at 220°C for 45 minutes, then spray with clear varnish. Textiles: Iron on the reverse side. Porcelain: Bake in oven at 160°C for 45 minutes, optionally spray with clear varnish. Metal: Spray with clear varnish. Glass: Bake in oven at 160°C for 45 minutes, then spray with clear varnish. Wood: Spray with clear varnish. Plastic: Spray with clear varnish. May arrive wrapped or unwrapped - please bear with us while we transition to unwrapped markers.