Method of forming and visualizing latent image
A method of visualizing a latent image includes: preparing a latent image composed of a plurality of paramagnetic seeds immobilized on a base in the form of an image, and a dispersion liquid of paramagnetic colloidal particles; immersing the latent image in the dispersion liquid of paramagnetic colloidal particles; and applying a magnetic field to the latent image and the dispersion liquid of paramagnetic colloidal particles.
1. An authenticity assessment method comprising:
preparing a latent image composed of a plurality of paramagnetic seeds immobilized on a base in the form of an image, and a dispersion liquid of paramagnetic colloidal particles;
immersing the latent image in the dispersion liquid of paramagnetic colloidal particles;
applying a magnetic field to the latent image and the dispersion liquid of paramagnetic colloidal particles; and
assessing authenticity on the basis of a visualized image.
2. A method of visualizing a latent image comprising:
preparing a latent image composed of a plurality of paramagnetic seeds immobilized on a base in the form of an image, and a dispersion liquid of paramagnetic colloidal particles;
immersing the latent image in the dispersion liquid of paramagnetic colloidal particles; and
applying a magnetic field to the latent image and the dispersion liquid of paramagnetic colloidal particles.
3. A method of visualizing a latent image comprising;
preparing a latent image composed of a plurality of paramagnetic seeds immobilized on a base in the form of an image, and a dispersion liquid of paramagnetic colloidal particles;
hydrophilizing a surface of the base having the latent image thereon, after preparing the latent image and the dispersion liquid of paramagnetic colloidal particles;
immersing the latent image in the dispersion liquid of paramagnetic colloidal particles; and
applying a magnetic field to the latent image and the dispersion liquid of paramagnetic colloidal particles.
4. A method of reproducing recorded information comprising:
preparing an information recording medium having a latent image composed of a plurality of paramagnetic seeds immobilized in the form of an image, and a dispersion liquid of paramagnetic colloidal particles;
immersing the latent image in the dispersion liquid of paramagnetic colloidal particles; and
applying a magnetic field to the latent image and the dispersion liquid of paramagnetic colloidal particles.
5. An article having an authenticity assessment unit comprising:
a closed cell, the interior of which is observable;
a base disposed on a bottom of the cell, the base having a latent image portion on which a plurality of paramagnetic seeds are immobilized in the form of an image; and
a dispersion liquid of paramagnetic colloidal particles, the dispersion liquid being filled in the cell.