Ah, such a lovely tutorial! I love how you always try and help out other artists. <3 You're amazing.
(Psst! Just a small fix for your tutorial- any clay that has sulfur will impede the mold making process. Sulfur disturbs the chemical reaction in silicone, and will make the mold cure improperly. So any clay but sulfites. XD Learnedthatthehardway,oi.)