An apparatus for producing an electrostatically charged and homogeneous C02 composite spray (194, 282) containing an additive for use on a substrate surface comprising: a. multiple nozzle electrodes positioned axis symmetrically about an additive injection nozzle; b. said nozzle electrodes comprising an elongated body with a nozzle tip with a center through hole, and arising from the center through hole are multiple axisymmetric through ports; c. proximate to said multiple through ports are landing guides for centering and positioning an adjustable expansion tube assembly; d. the adjustable expansion tube assembly comprises a first capillary within a second capillary; e. the first and the second capillaries are adjustable within the center through hole; f. the additive injection nozzle comprising a through ported and grounded additive injection nozzle body containing an additive delivery tube, and the grounded additive injection nozzle body flows air to form an air-additive aerosol; whereby C02 particles are flowed through the adjustable expansion tube assembly to create an electrostatic charge, which is shunted to the landing guides to electrostatically charge the nozzle electrodes, and the C02 particles then mix with air to form air-C02 aerosol; the electrostatically charged nozzle electrodes and the air-C02 aerosol passively charge the air-additive aerosol; the air-additive aerosol and the air-C02 aerosol combine away from the nozzles to form the electrostatically charged air-additive-CO2 aerosol, which is projected at the substrate surface, whereby the C02 particles and the additive interact to form the electrostatically charged and homogeneous C02 composite spray containing an additive mixture in the space between the nozzles and the substrate surface; and the electrostatically charged and homogeneous C02 composite spray containing an additive is projected at the substrate surface. a. multiple nozzle electrodes positioned axis symmetrically about an additive injection nozzle; b. said nozzle electrodes comprising an elongated body with a nozzle tip with a center through hole, and arising from the center through hole are multiple axisymmetric through ports; c. proximate to said multiple through ports are landing guides for centering and positioning an adjustable expansion tube assembly; d. the adjustable expansion tube assembly comprises a first capillary within a second capillary; e. the first and the second capillaries are adjustable within the center through hole; f. the additive injection nozzle comprising a through ported and grounded additive injection nozzle body containing an additive delivery tube, and the grounded additive injection nozzle body flows air to form an air-additive aerosol; whereby C02 particles are flowed through the adjustable expansion tube assembly to create an electrostatic charge, which is shunted to the landing guides to electrostatically charge the nozzle electrodes, and the C02 particles then mix with air to form air-C02 aerosol; the electrostatically charged nozzle electrodes and the air-C02 aerosol passively charge the air-additive aerosol; the air-additive aerosol and the air-C02 aerosol combine away from the nozzles to form the electrostatically charged air-additive-CO2 aerosol, which is projected at the substrate surface, whereby the C02 particles and the additive interact to form the electrostatically charged and homogeneous C02 composite spray containing an additive mixture in the space between the nozzles and the substrate surface; and the electrostatically charged and homogeneous C02 composite spray containing an additive is projected at the substrate surface. whereby C02 particles are flowed through the adjustable expansion tube assembly to create an electrostatic charge, which is shunted to the landing guides to electrostatically charge the nozzle electrodes, and the C02 particles then mix with air to form air-C02 aerosol; the electrostatically charged nozzle electrodes and the air-C02 aerosol passively charge the air-additive aerosol; the air-additive aerosol and the air-C02 aerosol combine away from the nozzles to form the electrostatically charged air-additive-CO2 aerosol, which is projected at the substrate surface, whereby the C02 particles and the additive interact to form the electrostatically charged and homogeneous C02 composite spray containing an additive mixture in the space between the nozzles and the substrate surface; and the electrostatically charged and homogeneous C02 composite spray containing an additive is projected at the substrate surface.