Check the bottom of the item. If it’s covered with glaze, this is definitely faience. Due to production technologies, porcelain items are never glazed at the bottom.
If there is no glaze at the bottom but you still have doubts, put a drop of water on the surface. If it’s faience, the water will be absorbed within several seconds.
Gently tap on the surface and listen. Porcelain sounds like a bell even when you barely touch it. When faience is touched, the sound is lower and less loud, a bit like solid plastic.
If you look at a porcelain item under a powerful source of light, you may notice light going through the material. Faience remains non-transparent.
Vert often, faience items are more colorful than porcelain ones because the fire temperatures are much lower. Some paints are partially destroyed at such temperatures. Porcelain is also painted on top of the glazing due to the temperatures.
There might be cracks on faience items over time, and they might fade in color. Porcelain is more durable in all ways.

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