This invention relates to colorants comprising a chromophore having two azo acetoacetanilide moieties, wherein said moieties each have at least one poly chain, preferably at least two such chains. The method includes: assigning first and second address sets in relation to data to be stored in a memory, a predetermined address offset is defined between the first address set and the second address set; writing the data to the first address set in response to a data write command; and reading the data from the second address set in response to a data read command. A method for preparing the gasoline is also provided.