Kit for marking and/or detecting alteration of fuel and its method thereof

A kit for marking, monitoring and/or detecting alteration of a fuel and/or solvent comprising:

• (i) at least one marker (S);
• and
• (ii) at least one substance,
• wherein the substance is capable of interacting with at least one laundering agent to protect and/or prevent marker (S) from being absorbed, adsorbed, or partially or completely removed by the laundering agent.

A fuel and/or solvent comprising:

• (i) at least one marker (S);
• and
• (ii) at least one substance, wherein the substance is capable of interacting with at least one laundering agent to protect and/or prevent marker (S) from being absorbed, adsorbed, or partially or completely removed by the laundering agent;
• and
• optionally, (iii) at least one marker (C), wherein the marker (C) is a quantitative marker.

A method of marking fuel and/or solvent, the method comprising:

• marking a fuel and/or solvent with:
• (i) at least one marker (S);
• and
• (ii) at least one substance,
• wherein the substance is capable of interacting with at least one laundering agent to protect and/or prevent marker (S) from being absorbed, adsorbed, or partially or completely removed by the laundering agent.

A method of monitoring, testing and/or detecting alteration of a first fuel with a second fuel and/or solvent, the second fuel and/or solvent comprising:

• (i) at least one marker (S);
• and (ii) at least one substance, wherein the substance is capable of interacting with at least one laundering agent to protect and/or prevent marker (S) from being absorbed, adsorbed, or partially or completely removed by the laundering agent;
• the method comprising:
• testing the fuel for the presence of marker (S), wherein the presence of marker (S) in the fuel is indicative that the fuel is altered;
• or
• (II) testing the fuel for the presence of the substance, wherein the substance is capable of being detected, and the presence of the substance is indicative that the fuel is altered;
• or
• (III) testing the fuel for the presence of at least one laundering agent.

A method of monitoring, testing and/or detecting alteration of a fuel, the fuel comprising:

• (i) at least one marker (S);
• and (ii) at least one substance, wherein the substance is capable of interacting with at least one laundering agent to protect and/or prevent marker (S) from being absorbed, adsorbed, or partially or completely removed by the laundering agent;
• the method comprising:
• (I) testing the fuel for the presence of marker (S), wherein the absence of marker (S) in the fuel is indicative that the fuel is altered;
• or
• (II) testing the fuel for the presence of the substance, wherein substance is capable of being detected, the absence of the substance is indicative that the fuel is altered.