Creating a speckled or stippled patina is a popular technique for adding character and an aged appearance to metal surfaces. Here are the most common methods:

1. Spray and Splatter Technique: Use a spray bottle or brush to apply patina solution, then flick or splatter droplets onto the surface for a random speckled effect.

2. Salt and Vinegar Aging: Apply a vinegar solution to the metal, sprinkle coarse salt, and let it react. The salt creates uneven stippling as it corrodes the surface.

3. Sponge Dabbing: Dip a sponge in patina solution and lightly dab it onto the metal to create a textured, stippled finish.

4. Toothbrush Flicking: Load a toothbrush with patina solution and run your thumb across the bristles to flick tiny droplets onto the metal.

5. Layered Oxidation: Apply multiple thin layers of patina, allowing each to dry partially before adding the next, creating depth and variation.

Each method offers unique results, so experiment to achieve your desired look. Always work in a well-ventilated area and wear protective gear when handling chemicals.