How can you soften van aken modeling clay?

To soften Van Aken modeling clay, you can knead it with your hands to warm it up, as the heat will make it more pliable. Additionally, you can mix in a small amount of a compatible softening agent like mineral oil or vegetable oil. Another method is to place the clay in a sealed plastic bag with a damp sponge for a short period, allowing the moisture to penetrate and soften the clay. Always test any additives on a small amount first to ensure they don't alter the clay's properties.