The use of dye in cupcakes largely depends on the recipe or baker's preference. Typically, cupcakes might contain food coloring if there's a need to achieve a specific color in the batter or frosting for aesthetic reasons, such as themed parties or specific decorations. Natural cupcakes, without any added colors, would not have dye in them. However, commercial cupcakes or those from some bakeries may include artificial colors to make them more visually appealing. For those concerned about artificial dyes, there are natural alternatives available, such as using beet juice for red coloring or turmeric for yellow, which can provide vibrant colors without the use of synthetic dyes.

Screen printing black ink on polyester shirts requires specific steps to ensure high-quality and long-lasting prints. First, choose an ink designed for polyester to prevent dye migration, where the fabric dye bleeds into the ink. Polyester-specific inks, such as polyester-friendly plastisol or water-based inks, are essential. Before starting, pre-treat the shirt with a low-bleed underbase primer to lock the fabric’s dye and prevent it from migrating to the surface. Next, properly cure the ink; polyester requires a lower temperature (around 275-300°F) compared to cotton to avoid scorching the fabric. Use a polyester-specific screen with a suitable mesh count, usually within the range of 110 to 160 meshes, for a detailed and vibrant print. Test the print on a similar fabric to adjust the pressure and squeegee angle for a crisp finish. After printing, let the ink fully cure according to the manufacturer's instructions to ensure durability. By following these steps, you can achieve professional-quality black ink prints on polyester shirts.

MO resin in the context of Asta Chemical refers typically to maleic anhydride-modified oil (MO) resin. It’s a synthetic resin produced by modifying natural oils with maleic anhydride, leading to a product that can improve the performance of various industrial coatings, inks, and adhesives. The modification process enhances the oil's reactive sites, making the resin more compatible with other components in formulations, thereby improving adhesion, durability, and drying times. Asta Chemical, though not a widely recognized brand or manufacturer in publicly available sources as of the last update in 2023, might be contextually referring to a company involved in producing or utilizing such resins.