What is laking?
a. attaching a pigment molecule to an insoluble salt, so it can be used as a paint
b. attaching a dye molecule to a soluble salt, so it can be used as a pigment
c. attaching a dye molecule to an insoluble salt, so it can be used as a pigment
d. attaching a pigment molecule to a soluble salt, so it can be used as a pigment

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