Akemi Darkener Plus AKEMI® Darkener Plus is a ready-to-use, solvent-based impregnation containing reactive modified siloxanes. Absorbed into the stone by capillary action, it reacts to form a polysiloxane that deepens and enriches the natural colour and structure of fine-ground and polished stone while leaving a water- and dirt-resistant impregnation behind. It does not form a film on the surface, so the polish stays intact and the stone continues to breathe. Its longer working time makes it well suited to larger surfaces, and it can be tinted with AKEMI® Stone Ink to intensify or change the stone’s colour. Deep, rich colour enhancement on fine-ground and polished stone Prolonged working time — easier to control on larger areas Tintable with AKEMI® Stone Ink (up to 30%) to adjust or change colour No surface film — keeps the polish and lets the stone breathe Weather-resistant, non-yellowing — for indoor and outdoor use .dst-accordion { margin-top: 25px; border: 1px solid #FDDCC5; border-radius: 6px; overflow: hidden; } .dst-accordion-item { border-bottom: 1px solid #FDDCC5; } .dst-accordion-item:last-child { border-bottom: none; } .dst-accordion-toggle { display: none; } .dst-accordion-label { display: flex; justify-content: space-between; align-items: center; padding: 14px 20px; cursor: pointer; font-size: 17px; font-weight: 700; color: #231F20; background: #fff; transition: background 0.2s; } .dst-accordion-label:hover { background: #FFF3EB; } .dst-accordion-label::after { content: '+'; font-size: 22px; font-weight: 700; color: #F15C22; transition: transform 0.3s; } .dst-accordion-toggle:checked + .dst-accordion-label { background: #FFF3EB; } .dst-accordion-toggle:checked + .dst-accordion-label::after { content: '\2212'; } .dst-accordion-content { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; padding: 0 20px; background: #fff; } .dst-accordion-toggle:checked ~ .dst-accordion-content { max-height: 5000px; padding: 15px 20px 20px; } Available Options This product is offered in the following options — select your choice above: Size Item Reference 1 L CARE.10991 5 L CARE.10992 Specifications Property Detail Brand Akemi Manufacturer AKEMI GmbH, Nuremberg, Germany Product Type Solvent-based colour-enhancing impregnation Chemical Basis Reactive modified siloxanes (forms a polysiloxane on curing) Color Opaque liquid (tintable with AKEMI® Stone Ink) Density Approx. 0.92 g/cm³ (7.7 lb/gal) Coverage Approx. 407–814 ft²/gal (10–20 m²/liter) Optimal Working Temp. 59–77°F (15–25°C) Wipe-Off Time Remove excess approx. 10–15 min after application Max. Tint Addition Up to 30% AKEMI® Stone Ink Use Location Indoor and outdoor Tool Cleaner AKEMI® Nitro-Dilution Shelf Life 2 years, sealed, stored cool Interior/Exterior Interior, Exterior Application Enhancer Manufacturer Part Number CARE.10991, CARE.10992 Surfaces Natural Stone Features & Benefits Intensifies the natural colour and structure of fine-ground and polished stone Maintains the lustre of the polish Can be coloured with AKEMI® Stone Ink to intensify or change the stone’s colour Does not form a layer on the surface and allows the stone to breathe Excellent weather resistance and durability; non-yellowing Prolonged working time for easier application Water- and dirt-resistant effect; for indoor and outdoor use Applications For fine-ground and polished absorbent natural and artificial stone, including: Marble, slate, Solnhofen limestone, sandstone Granite and gneiss Concrete ashlar Colour enhancement is very durable on silicate-based stone and durable on lime-based stone. Not suitable for glazed or non-absorbent surfaces. Directions for Use Disregarding the processing guidelines can lead to irreparable damage — always prepare a 1–2 m² sample area first, especially when tinting. Clean the surface — it must be clean, totally dry, and free from all residues and harmful salts. Use the appropriate AKEMI® cleaner, rinse with water, and let the stone dry completely (1–2 days). Optimal working temperature is 59–77°F (15–25°C); protect from rain for approx. 24 hours and keep out of direct sun and underfloor heat. For colour adjustment, tint with AKEMI® Stone Ink (max. 30%). Once tinted, use within 1 day. Apply undiluted with a brush, paint roller, or spraying device in a thin, smooth layer, allowing the product to absorb into the stone. Approx. 10–15 minutes after application, remove all excess with an absorbent cloth. Surfaces treated with tinted product should additionally be cleaned with AKEMI® Cleaner I. Re-polish polished surfaces until any haze is completely removed. Clean tools with AKEMI® Nitro-Dilution. Safety & Handling Seal the reverse and lateral faces of the stone (e.g. with AKEMI® Anti-Stain Coating 2015) so that rising moisture cannot penetrate. On some stones (e.g. Nero Assoluto, Nero Impala) natural structures may be enhanced more strongly than the surrounding surface — this is a stone characteristic, not a product defect. When spraying, avoid aerosol formation, do not breathe vapours, and wear a protective mask. Clean spray nozzles and parts in contact with the product to prevent sticking. Protect nearby solvent-sensitive materials (synthetics, rubber, lacquered parts); use a liquid-glove hand protector. Inaccurately applied product can often be removed with AKEMI® Impregnation Remover; empty the container completely for disposal. Industrial chemical product — use only in well-ventilated areas and wear chemical-resistant gloves and eye protection. Always consult the AKEMI Safety Data Sheet (SDS) before use. Documentation 📄 AKEMI Stone Care Product Portal — Technical Data Sheet & SDS (manufacturer) Industrial chemical product. Use only in well-ventilated areas. Wear chemical-resistant gloves and eye protection. Consult the AKEMI Safety Data Sheet (available from the manufacturer or stein.akemi.de) before use. Technical values are manufacturer figures at 68°F (20°C) and may vary with jobsite conditions.
