Blacklight Reactive Electric Neon Permanent Fabric Markers 5 Pack Blacklight Reactive ONLY. Does NOT glow in the dark Draw or write with markers directly on fabric. No ironing needed. Dry flat overnight. Prewash fabric to remove sizing. Do not use fabric softener. Markers work best on light colored fabrics; test before using. Wash in warm water, gentle cycle with mild soap after 24 hours; line dry. Do not dry clean. Shake marker well before use