The flow diagram shows the stages in testing a green leaf for starch.
1, 2, 3 and 4 are all liquids.
What are the colours of liquids 2 and 4 for a leaf that contains starch?

2: green / 4: blue /black
2 )
2: colourless / 4: brown
3 )
2: colourless / 4: blue /black
4 )
2: green / 4: brown
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