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1. Ninhydrin :

Ninhydrin, is a chemical used to detect ammonia or primary and secondary amines. When reacting with these free amines, a deep blue or purple color is evolved. Ninhydrin is most commonly used to detect fingerprints, as amines left over from peptides and proteins (terminal amines or lysine residues) sloughed off in fingerprints react with Ninhydrin.

Ninhydrin can also be used to monitor deprotection in solid phase peptide synthesis. When the growing peptide chain is deprotected, a ninhydrin test yields blue. If the next peptide residue is coupled then the test is colorless or yellow.
Ninhydrin is also used in amino acid analysis of proteins: Most of the amino acids are hydrolyzed and reacted with ninhydrin except Proline; Also, certain amino acid chains are degraded. Therefore, separate analysis is required for identifying such amino acids that either react differently or don't react at all with ninhydrin. The rest of the amino acids are then quantified colorimetrically after separation by chromatography.

A solution suspected of containing the ammonium ion can be tested by ninhydrin by dotting it onto a solid support (such as silica gel); treatment with ninhydrin should result in a dramatic purple color if the solution contains this species.(click here)

Ninhydrin
General
Systematic name	Triketohydrindane hydrate
Chemical formula	C9H6O4
Appearance	White pale yellow crystals
CAS number	[485-47-2]
EINECS No	207-618-1

2. MERCURIC SULFATE

3. MERCURIC CHLORIDE

4. MERCURIC NITRATE

5. MERCURIC OXIDE

6. 5-AMINO TETRAZOLE
Tetrazole is one of a class of organic heterocyclic compounds containing a five-membered diunsaturated ring structure composed of four nitrogen atoms and one carbon atom. The simplest member of the tetrazole family is tetrazole itself, white to pale yellow crystalline solids with a weak characteristic odor; soluble in water and alcohol, melts at 156 C. It is used as a gas generating agent for air bags. Tetrazole and its derivatives are used for biological activities such as antiviral, antibacterial, antifungal and antituberculous. They are used as catalysts in the synthesis of phosphonates.

Oligonucleotide is a short DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) sequence, typically made up of a few (2-20) covalently linked nucleotides. In molecular genetics, a short sequence synthesized to match a region where a mutation is known to occur, and then used as a probe for detecting complementary DNA or RNA. Oligonucleotides are currently used for genomic,proteomic and drug discovery technologies. Tetrazole is the traditional oligonucleotide synthesis activato for good coupling efficiency and to decrease the coupling times.

5-Aminotetrazole is used as an intermediate for manufacturing organic compounds. It is used as a gas generator (nitogen) and used in air bag.