Standard Dark Blue - found at - Balloon Splendor 

Standard blue and other standard and fashion tone balloons are opaque with a smooth finish.

Jewel tone balloons are transparent with a shiny finish.

Pearl tone balloons have a matte finish and are opaque. Silver and gold balloons are like pearl tones in finish and transparency.

Neon balloons are semi transparent, have a matte finish and are black light activated.