Green synthesis of nanoparticles is a relatively new branch of nanotechnology that has many advantages over chemical and physical methods of nanoparticle synthesis. The process is safe, simple, cost- effective, environmentally friendly, reduces the amount of energy required and often results in more stable materials, and there is no need for high temperatures or pressures. Due to the rich biodiversity of plants and their potential secondary metabolites, plants and plant parts have been well utilized in recent times in the synthesis of various nanoparticles. In this work, colloidal silver was synthesized in an ecological way without the use of organic or toxic solvents. The synthesis was carried out using green tea as a reducing and stabilizing agent at pH values of 6, 7, 8 and 9 with the use of silver nitrate solution with a concentration of 0.001 mol dm- 3. Sodium carbonate solution with a concentration of 0.1 mol dm-3 was used to adjust the pH value and distilled water was used as a solvent. Green tea is rich in catechins that belong to the group of flavanols and participate in the reduction reaction of silver ions. The characterization of colloidal silver was carried out with a UV-Vis spectrophotometer, FTIR analysis, DLS (Dynamic Light Scattering) analysis and determination of the Tyndall effect by passing a laser beam through the solution. Dynamic light scattering analysis was used to assess the size of the silver nanoparticles and the uniformity of the sample, while the UV-Vis spectrophotometer was used to prove the presence of silver nanoparticles by the appearance of surface plasmon resonance. The size range of nanoparticles obtained by chemical reduction using green tea solution is from 32 nm to 143 nm.