Emulsion paint, due to its water-based nature, is easier to clean off clothes while it's still wet. Start by removing excess paint with a spoon or the edge of a knife, being careful not to spread it further. Rinse the stained area under cold running water to wash out as much paint as possible. Apply a liquid laundry detergent directly to the stained area, gently rubbing it in. Let it sit for a few minutes, then wash the garment on the highest temperature setting safe for the fabric. For dried paint, scraping off the dried bits first helps, followed by soaking in warm, soapy water. Stubborn stains may require treatment with a stain remover before washing. Always check the garment's care label before attempting any cleaning procedure.

The process of injecting dye into fish, often referred to as "painting," is a controversial method used primarily to enhance the aesthetic appeal of ornamental fish for the aquarium trade. This involves physically injecting a colored dye into the fish's body or immersing the fish in a solution that allows the dye to be absorbed through the skin. The methods can be distressing and harmful to the fish, causing stress, susceptibility to diseases, and in many cases, reducing their lifespan. Critics argue that this practice is unethical, prioritizing cosmetic appeal over the well-being of the fish, and advocate for natural beauty appreciation and better welfare standards in the aquarium industry. There is a growing movement among enthusiasts and professionals towards rejecting dyed fish, promoting the keeping of fish in their natural, undyed state.

Ink is generally considered a homogeneous mixture because its components are uniformly distributed throughout the solution, meaning that any given sample of ink will have consistent properties. At its core, ink is a mixture of colorants (pigments or dyes), solvents (such as water or alcohol), and various additives designed to adjust flow properties, drying time, and permanence. When ink is properly mixed, the colorants are evenly dispersed in the solvent, creating a uniform color and consistency. However, under certain conditions, like evaporation of the solvent or improper mixing, ink can exhibit some heterogeneity, resulting in color or composition variation. Advanced manufacturing processes ensure the high homogeneity of ink for various applications, from writing instruments to printers, achieving consistent performance.