The color of tea cake can vary depending on its recipe and ingredients used. Tea cakes can come in different hues, but they are typically not classified based on whether they are white or black like traditional teas. Instead, their color is determined by factors such as the type and amount of sugar used (which might give it a lighter or darker shade) or if there are additions like cocoa powder (which could result in a chocolate-colored cake). Ultimately, whether a tea cake is white or black largely depends on individual recipes and personal preferences for taste and appearance.