A method comprising: generating light from a light source; directing the light toward an anti-copy material, comprising: a fluorescent material having a fluorophore configured to absorb incident light having an excitation wavelength in a visible spectrum and to emit light having a fluorescent wavelength in the visible spectrum, and wherein the incident light includes one or more peak wavelengths in the visible spectrum different from the excitation wavelength, wherein the fluorescent material includes a shell surrounding the fluorophore, wherein the shell surrounds a fluorescent dye in solution with a solvent, and one or more optical absorbers configured to absorb substantially all of the incident light having the one or more peak wavelengths in the visible spectrum, wherein the one or more optical absorbers includes an optically absorptive pigment or an optically absorptive dye, wherein the shell surrounds at least one of an optically absorptive pigment or an optically absorptive dye; wherein the excitation wavelength is in a blue color range of the visible spectrum, and wherein the fluorescent wavelength is in a green color range of the visible spectrum; directing the light toward a barcode; capturing an image of the barcode while illuminated by the light; comparing the captured image to a stored barcode pattern, the stored barcode pattern representing an authentic version of the barcode when the authentic version is illuminated with light from a representative version of the light source; and determining that the barcode is authentic when the captured image substantially matches the stored barcode pattern, wherein the stored barcode pattern does not visually match the authentic version of the barcode when the authentic version of the barcode is viewed in ambient lighting. generating light from a light source; directing the light toward an anti-copy material, comprising: a fluorescent material having a fluorophore configured to absorb incident light having an excitation wavelength in a visible spectrum and to emit light having a fluorescent wavelength in the visible spectrum, and wherein the incident light includes one or more peak wavelengths in the visible spectrum different from the excitation wavelength, wherein the fluorescent material includes a shell surrounding the fluorophore, wherein the shell surrounds a fluorescent dye in solution with a solvent, and one or more optical absorbers configured to absorb substantially all of the incident light having the one or more peak wavelengths in the visible spectrum, wherein the one or more optical absorbers includes an optically absorptive pigment or an optically absorptive dye, wherein the shell surrounds at least one of an optically absorptive pigment or an optically absorptive dye; wherein the excitation wavelength is in a blue color range of the visible spectrum, and wherein the fluorescent wavelength is in a green color range of the visible spectrum; a fluorescent material having a fluorophore configured to absorb incident light having an excitation wavelength in a visible spectrum and to emit light having a fluorescent wavelength in the visible spectrum, and wherein the incident light includes one or more peak wavelengths in the visible spectrum different from the excitation wavelength, wherein the fluorescent material includes a shell surrounding the fluorophore, wherein the shell surrounds a fluorescent dye in solution with a solvent, and one or more optical absorbers configured to absorb substantially all of the incident light having the one or more peak wavelengths in the visible spectrum, wherein the one or more optical absorbers includes an optically absorptive pigment or an optically absorptive dye, wherein the shell surrounds at least one of an optically absorptive pigment or an optically absorptive dye; wherein the excitation wavelength is in a blue color range of the visible spectrum, and wherein the fluorescent wavelength is in a green color range of the visible spectrum; directing the light toward a barcode; capturing an image of the barcode while illuminated by the light; comparing the captured image to a stored barcode pattern, the stored barcode pattern representing an authentic version of the barcode when the authentic version is illuminated with light from a representative version of the light source; and determining that the barcode is authentic when the captured image substantially matches the stored barcode pattern, wherein the stored barcode pattern does not visually match the authentic version of the barcode when the authentic version of the barcode is viewed in ambient lighting.