The stair color is original - but we did match it fairly well using a "hard shake" oxide concrete colorant. This is a powered material that is "sprinkled" on the still wet concrete, then troweled. Don't try using a color mixed at the batch plant - the colors won't be this vivid. Thanks!

Thanks for explaining! 🙏 This very closely resembles the red oxide flooring which is done in india, hence checked.