Which solvent results in the least damage to inks when used in Ninhydrin solutions?

The selection of Freon 113 as the solvent that results in the least damage to inks when used in Ninhydrin solutions is based on its chemical properties and solvent characteristics. Freon 113 is a chlorinated solvent known for its non-polar nature, which means it interacts less aggressively with polar substances such as inks. This quality allows it to dissolve the Ninhydrin without adversely affecting the ink composition.

Inks often contain various dye components that can be sensitive to harsh solvents, potentially leading to fading or degradation. Freon 113 is less likely to disrupt these components compared to more aggressive solvents like acetone, methyl alcohol, or ethyl alcohol, which can denature or alter the structure of ink dyes due to their stronger solvent abilities.

Consequently, when processing latent prints with Ninhydrin—a chemical that reacts with amino acids found in fingerprint residues—using Freon 113 can enhance the reliability of obtaining clear prints while safeguarding the integrity of the ink on the substrate.