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Brown/Orange/Yellowy
cause iodine(brown) stains the rice
If we add salivary amylase to any solution ( eg:iodine solution) the colour of solution changes to blue.THE TIME TAKEN BY THE SALIVARY AMYLASE TO CHANGE ITS(iodine solution) COLOUR TO BLUE IS CALLED ACROMATIC POINT OF SALIVARY AMYLASE. ie, the time upto which the solution is colourless and after that it gains blue colour.
It turns a dark purple/blue colour
it is a yellowish/orange colour but when iodine is present, than it will turn an dark-blue/black colour
iodine solution
starch will not change its own colour but it can change the colour of iodine solution. iodine solution is originally brown. after adding starch, it will turn into dark blue.
Petrol changes color when mixed with iodine solution due to covalent bonding.
negative
The color not change.
When iodine reacts with starch, the solution will turn a brownish colour.
Indicates that there is starch in the solution. One can be sure if the solution changes to a dark-purplish color.