Compositions for use in security marking

1. A system comprising a security marking composition and a database, wherein the security marking composition comprises:

a plurality of identical first synthetic nucleotide oligomers; and

a plurality of identical second synthetic nucleotide oligomers which are different to the first synthetic nucleotide oligomers,

wherein each of the first synthetic nucleotide oligomers consists of a first primer binding sequence of bases, a first identifier sequence of three to seven bases in length, and a second primer binding sequence of bases, the first identifier sequence being disposed between the first and second primer binding sequences,

wherein each of the second synthetic nucleotide oligomers consists of a third primer binding sequence of bases, a second identifier sequence of three to seven bases in length, and a fourth primer binding sequence of bases, the second identifier sequence being disposed between the third and fourth primer binding sequences,

wherein the first and second primer binding sequences are different to each other and to each of the third and fourth primer binding sequences,

wherein the first identifier sequence is different to the second identifier sequence,

wherein the database connects information on an owner of the composition to the first and second identifier sequences, and

wherein the security marking composition further comprises one or more of a fluorescent material, a plurality of microdots, a propellant, a grease and/or a gel.

2. A system according to claim 1 , wherein the first identifier sequence has a length in the range four to six bases.

3. A system according to claim 1 , wherein the second identifier sequence has a length in the range four to six bases.

4. A system according to claim 1 , wherein the third and fourth primer binding sequences are different.

5. A system according to claim 1 , wherein the first, second, third and fourth primer binding sequences each have a length in the range 5to 40 bases.

6. A system according to claim 5 , wherein the first, second, third and fourth primer binding sequence each have a length in the range of 10 to 30 bases.

7. A security marking composition, wherein the security marking composition comprises:

a plurality of identical first synthetic nucleotide oligomers; and

a plurality of identical second synthetic nucleotide oligomers which are different to the plurality of identical first synthetic nucleotide oligomers,

wherein each of the plurality of identical first synthetic nucleotide oligomers consists of a first primer binding sequence of bases, a first identifier sequence of three to seven bases in length, and a second primer binding sequence of bases, the first identifier sequence being disposed between the first and second primer binding sequences,

wherein each of the plurality of identical second synthetic nucleotide oligomers consists of a third primer binding sequence of bases, a second identifier sequence of three to seven bases in length, and a fourth primer binding sequence of bases, the second identifier sequence being disposed between the third and fourth primer binding sequences,

wherein the first and second primer binding sequences are different to each other and to each of the third and fourth primer binding sequences,

wherein the first identifier sequence is different to the second identifier sequence,

wherein information on an owner of the composition is provided by the first and second identifier sequences using a database which connects information on an owner of the composition to the first and second identifier sequences, and

wherein the security marking composition further comprises one or more of a fluorescent material, a plurality of microdots, a propellant, a grease and/or a gel.

8. A pressurized container housing the composition according to claim 7 , the composition comprising the propellant, the pressurized container comprising a nozzle for spraying said composition.

9. A plurality of containers, each container comprising a composition according to claim 7 , wherein each container is identifiable by a unique combination of the first and second identifier sequences.

10. A plurality of containers according to claim 9 , comprising a plurality of batches of containers, wherein the first identifier is for identifying the batch to which a container belongs and the second identifier is for uniquely identifying each container within said batch.

11. A security marking kit, the kit comprising:

(1) a security marking composition according to claim 7 and/or a pressurized container housing the security marking composition along with a propellant and a nozzle for spraying said composition; and

(2) instructions for recording ownership of the kit in a database.

12. The security marking composition of claim 7 , further comprising an adhesive.

13. A method of determining an owner of a security composition, the method comprising:

taking a sample of the security composition;

reacting one or both of the first and second synthetic nucleotide oligomers with primers which bind to the first and second and/or third and fourth primer binding sequences to increase the length of one or both of the first and second synthetic nucleotide oligomers;

amplifying one or both of the first and second synthetic nucleotide oligomers using a polymerase chain reaction;

sequencing the amplified synthetic nucleotide oligomers to identify the first and/or second identifier sequence; and

consulting a database to match the identified first and/or second identifier sequence with information about the owner of the composition, wherein the database connects information on the owner of the composition to the first and second identifier sequence;

wherein the security marking composition comprises:

a plurality of identical first synthetic nucleotide oligomers; and

a plurality of identical second synthetic nucleotide oligomers which are different to the first synthetic nucleotide oligomers,

wherein each of the first synthetic nucleotide oligomers consists of a first primer binding sequence of bases, a first identifier sequence of three to seven bases in length, and a second primer binding sequence of bases, the first identifier sequence being disposed between the first and second primer binding sequences,

wherein each of the second synthetic nucleotide oligomers consists of a third primer binding sequence of bases, a second identifier sequence of three to seven bases in length, and a fourth primer binding sequence of bases, the second identifier sequence being disposed between the third and fourth primer binding sequences,

wherein the first and second primer binding sequences are different to each other and to each of the third and fourth primer binding sequences,

wherein the first identifier sequence is different to the second identifier sequence,

wherein information on an owner of the composition is provided by the first and second identifier sequences using a database which connects information on an owner of the composition to the first and second identifier sequences.

14. A method according to claim 13 , wherein the primers have a length in the range 50 to 200 bases.

15. A method according to claim 14 , wherein the primers have a length in the range of 50 to 100 bases.