Rapid Set® DARK: Darkens the color of your mix

By adding DARK from the Concrete Pharmacy®, your cement, concrete, mortar, plaster and grout mixtures will become darker in color. Use increased quantities of DARK to match new concrete to existing concrete or to produce a custom-color concrete. DARK is effective with virtually all types of cement mixtures and may be used with all additives in the Concrete Pharmacy®.



The Datasheet explains the performance and technical characteristics of Rapid Set® DARK.  It also shows how to use DARK.


The Safety Data Sheet (SDS) outlines information and procedures for handling and working with Rapid Set® DARK.  It includes physical and chemical property information, potential hazards, emergency procedures and CTS’s contact information.


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Standard Practices

Standard Practices

Q: What is DARK?
 It is a black color pigment used to darken your mix. It assists in matching repairs to darker existing walls, slabs, and ceilings.

Q: How much is in a packet?
 Each packet contains 120 grams (4.24 ounces).

Q: How much do I need to use?
 1 to 8 packets per 55 or 60 lb bag is usually sufficient to match most existing concretes. A trial batch is recommended to determine your specific needs.

Q: How do I add it to my mix?
 Add the DARK to your material and water mixture and mix until thoroughly distributed.

Q: Can I use it with other additives?
 It can be used with other Rapid Set® Concrete Pharmacy® items or certain approved additives.

Q: Can I add it to other portland cement products?
 Yes, but a trial batch is recommended to determine your project’s requirements. You will need to maintain similar conditions, proportioning, batching, and finishing to get consistent results.

Jobs & Applications

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Leed Product Evaluation

TechnicalSupportWhether you’re working on a time-sensitive project and need answers, or evaluating and choosing the right cement products, or looking to achieve specific results, we are here to help. Get answers to your questions from our technical support team. Find and download useful information from our website. Ask us to help get your construction team up to speed by requesting a jobsite demonstration or educational seminars.

ConcreteCalculatorLearn how Rapid Set’s strength, speed and sustainability help you get better results and finish your jobs sooner. These Charts will show you how.

ProductEvaluationLEED product evaluations summarize a product’s ability to contribute to a variety of LEED credits. These credits include Solar Reflectivity (SS7), Regional Materials (MR4), Recycled Content (MR5), VOC Content (EQ4) and Innovation in Design (ID1).

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