The question of whether dye affects behavior pertains largely to food coloring and its impact on human health, especially in children. Research in this area has been mixed, but some studies suggest certain artificial food dyes may be linked to hyperactivity and attention disorders in susceptible children. However, the evidence isn’t strong enough to draw broad conclusions applicable to all individuals. In 2007, a study in the UK found some association between increased hyperactivity in children and the consumption of artificial colors, but subsequent research has been inconclusive. Regulatory bodies like the FDA maintain that the current evidence does not substantiate a clear link between food dyes and behavioral issues. Nonetheless, individual sensitivities can vary, and some people may experience adverse effects from certain dyes. For those concerned, opting for natural colorings or dye-free foods could be a worthwhile precaution.

The phrase "747 for horses" seems to be misconstrued or misinterpreted in the question's context, especially relating to non-synthetic amino acids. Amino acids are organic compounds that play critical roles in various biological processes, including as building blocks of proteins. Some amino acids are synthesized by the body (non-essential), while others must be obtained from the diet (essential). In equine nutrition, amino acids like Lysine and Methionine are crucial for horse health and are often included in feed supplements, which can be synthetic or derived from natural sources. There's no specific amino acid known as "747" in scientific or nutritional contexts for horses or otherwise. It's essential to consult with a veterinarian or an equine nutritionist for accurate information related to horse supplements and their composition.

To resin coat a tumbler, start by thoroughly cleaning the tumbler to remove any dust or grease. Next, you'll want to mix your epoxy resin according to the manufacturer's instructions. It’s critical to get the ratio right for a hard, clear finish. Once mixed, apply a thin, even coat of resin to the tumbler using a foam brush or silicone spatula. Some prefer to use a turner to rotate the tumbler and ensure an even coat. Allow the resin to cure as per the product's guidance, usually between 12-24 hours, in a dust-free environment. You may want to sand any imperfections between layers if applying more than one. Remember to work in a well-ventilated area and wear protective gear to avoid inhaling fumes or getting the resin on your skin.