Which of the following should clients avoid prior to their microblading appointment?

Clients should avoid consuming alcohol and blood thinners before their microblading appointment because both substances can significantly affect the outcome of the procedure. Alcohol thins the blood, which may lead to excessive bleeding during the microblading process. This can hinder the artist's ability to implant pigment into the skin successfully and impact the overall healing process. Blood thinners, whether prescribed or over-the-counter, have a similar effect of increasing bleeding, which can not only complicate the procedure but also increase the risk of bruising.

Managing these factors is crucial for achieving the best possible results and ensuring a smoother healing process following the treatment. In contrast, other options like hydrating the skin and preparing with eyebrow makeup do not pose risks and could even enhance the microblading experience. Planning for a full day of activities is not directly related to the treatment's efficacy but rather to client's comfort and post-care. Focusing on avoiding substances that affect blood flow is essential for a successful microblading outcome.