This allows the fibres to optimally reflect light, leaving you with a deep and luminous black colour. This laundry detergent is safe for all makes of high-efficiency washing machines and is designed for the care and revitalization of black and dark-coloured fabrics. Astro Plus (Dark & Black Protection Liquid) has the perfect balance of cleanliness and care, keeping the darks you love vibrant even after 20 washes! Astro Plus (Dark & Black Protection Liquid) formula contains an active ingredient that acts as a dye magnet that collects loose dye particles during the wash cycle, preventing colour transfer & fading so dark colours stay dark for longer.