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Our Bubble Cake Hardener is contains a higher-grade of Potassium Bitartrate, also known as Cream of Tartar, which is specifically designed for cosmetic use. Bubble cake hardener is a great ingredient to add to bubble cakes/bubble bars and bath bombs to uniformly harden the formulation.
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We currently ship within the US, with more countries coming soon.
Final cost and dates are confirmed at checkout.
🇺🇸 Ship from USA · On Agora since 2026
$5.19