Rob Smith's Silicone Flow Blood Arterial - Venous - Aged 40ml Robert Smith Blood £6.99 Silicone Flow Blood 40ml: [Choose]ArterialVenousAged Quantity: at £6.99 each Add To Basket 7 in stock. Silicone Flow Blood is mouth safe and washable but has extra flow properties. It will run like real blood and not bead on silicone props/appliances and direct applied effects. This is the blood that is best suited for pumping as it will flow through tubing with minimal watering down and has more pigment so as not to loose colour intensity/ opacity Available in 3 shades Artierial (Light) Venous (Dark) Aged Silicone Flow Blood is Sorbitol based and was developed to flow naturally on silicone props. It is very free flowing on skin and smudges very thinly.