Removing the "sand vein" (a euphemism for the digestive tract) is referred to as "deveining". The sand vein can be removed by making a shallow cut lengthwise down the outer curve of the shrimp's body, allowing the dark ribbon-like digestive tract to be removed with a pointed utensil. Special deveining tools are sometimes used but knives, skewers, and even toothpicks can be used to devein.[12][13] Alternatively, if the tail has been detached, the vein can be pinched at the tail end and pulled out completely with the fingers. On large shrimp, the "blood vein" (a euphemism for the ventral nerve cord) along the inner curve of the shrimp's body is typically removed as well. The shrimp is then rinsed under cold running water. Removing the vein is not essential, as it is not poisonous and is mostly tasteless.[14] Deveining does slightly change the flavour and makes it more consistent.[15] Shrimp also sometimes consume small amounts of sand by accident and the vein thus might be gritty.