Selling our 10 month suckler calves at a different auction this spring and they like the calves marked to how we are going to sell them in advance. So looking for a way of marking the calves into their batches so the auction staff can tell which calves to pull out of a long race prior to the sale. Sheep marker sprays tend to fade too fast as we generally sort, clip and aim to mark them a week in advance of the sale. Any suggestions?