Development of Natural Luminescent Powder for the Detection of Latent Fingerprint.

<b>Background and Objective:</b> Nowadays, Dyes is widely used to improve fingerprints identification test. Natural dyes are another interesting way that can be used instead of chemical dyes because of its non-toxicity and lower cost. In this research, the development of rust powder from <i>Plumeria</i> tree was applied for fingerprints identification due to its fluorescence property under UV.

A novel liquid colorimetric probe for highly selective and sensitive detection of lead (II).

A novel liquid colorimetric sensor based on deep eutectic solvent (DES) was developed for the preconcentration and detection of Pb in fruit juice, milk and cereal samples. The colorimetric probe was simply fabricated by adding dithizone (DZ) into DES, prepared from choline chloride and phenol. Pb was formed complex with DZ in the probe, providing hydrophobic complex of [Pb-DZ] which was simultaneously extracted into DES and the color was changed from light orange to carmine red.