Method for preparing colorant having target color and colorant

A method for preparing a colorant having a target color, comprising:

• configuring submicron particles prepared from a predetermined material to have a predetermined size, wherein the predetermined size is associated with a predetermined hue;
• adjusting a ratio of the submicron particles prepared from the predetermined material to cuttlefish juice submicron particles to a predetermined ratio, wherein the predetermined ratio is associated with a predetermined color saturation;
• evaporating a predetermined solution mixed with the submicron particles prepared from the predetermined material and the cuttlefish juice submicron particles such that the submicron particles prepared from the predetermined material and the cuttlefish juice submicron particles can be self-assembled into an amorphous photonic crystal structure;
• acquiring spectral data for reflected light generated by incident light irradiating the amorphous photonic crystal structure;
• determining whether the spectral data meets a predetermined condition, wherein the predetermined condition is associated with the target color;
• and
• responsive to determining that the spectral data does not meet the predetermined condition, adjusting at least one of the ratio or a size of each of the submicron particles prepared from the predetermined material, until the spectral data meets the predetermined condition to generate the colorant having the target color based on the amorphous photonic crystal structure.