With orders of $35 or more, you can snag a deluxe "mystery sample" of the soon-to-launch product by using the code "TATCHA" on both Sephora.com and Tatcha.com. The brand still hasn't revealed any details about the formula, but we do know that it will be announced this Friday at 11 a.m. PST/2 p.m. EST. Tatcha has also been dropping teasers, leaving followers on Instagram to guess two truths and one lie from three hints: 1. The key ingredient can be used to make pottery, 2. It has a sister moisturizer , and 3. It can be used in the shower.