Golden Fluid Interference Acrylics - Interference Gold Fine - 4 oz Bottle Add gels for impasto effects or thin with mediums for glazing applications. Add a very small amount of black to interference colors to produce deeper, richer, opalescent effects. 1 oz. bottle. Combine interference colors with small amounts of color to achieve unique color ranges. Country of Origin: US. Shipping Dimensions: 2"Lx2"Wx5"H. Shipping weight: 0.31lbs.