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Starches turn blue-black when stained with iodine (which usually stains things a reddish-brown or amber color).
Iodine turns blue black when starch is present

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13y ago

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What do you observe when you observe a potato stained with iodine?

If the iodine on/in the potato turns dark blue/purple/black, it means the iodine has reacted to the starch in the potato and has changed color.


What substance is present if iodine soluntion turns blue-black?

If iodine solution turns blue-black, it indicates the presence of starch. Iodine forms a complex with starch, resulting in the blue-black color.


What color does iodine turn in starch?

Iodine turns blue-black in the presence of starch.


What colour does iodine go in the presence of starch?

Iodine turns blue-black in the presence of starch.


Which white powder turns blue-black in iodine solution?

Starch powder turns blue-black in iodine solution due to the formation of a starch-iodine complex.


What color does iodine turn if a starch is present?

Iodine turns blue-black in color in the presence of starch.


What is starch tested for?

Iodine solution turns blue/black


What color does iodine turn in the presence of startch?

Iodine turns blue-black in the presence of starch due to the formation of a complex between iodine and starch molecules.


What color does iodine turn when a starch is present?

Iodine turns blue-black in the presence of starch.


What color is starch with iodine solution?

it is a yellowish/orange colour but when iodine is present, than it will turn an dark-blue/black colour


Iodine turns what colour when its positive for starch?

Iodine turns blue-black when it tests positive for starch due to the formation of a starch-iodine complex.


When iodine solution turns blue black what substance is present?

Starch