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1. The shape of the object, while you can not use color.
2. Red liquid.
3. Change the color of the glass to blue, add shaded areas inside the bubble and a light area on the intended surface of the liquid.
4. Add white highlights on the bubble, and a dark red 1 pixel wide shadow on the liquid areas bordering the bubble walls. Looks good, doesn't it?
5. Similarly, we draw a bottle with a blue liquid - here the same color of glass, plus three shades of blue for the liquid.
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