![Any idea what is happening here? At each line of use a black line has appeared inside the jug. The milk is not expired. It is placed back in the fridge immediately Any idea what is happening here? At each line of use a black line has appeared inside the jug. The milk is not expired. It is placed back in the fridge immediately](https://preview.redd.it/2bijtgxv89871.jpg?width=640&crop=smart&auto=webp&s=f68f4900e6c584626e9cf00af66c28f1e03e5c7c)
Any idea what is happening here? At each line of use a black line has appeared inside the jug. The milk is not expired. It is placed back in the fridge immediately
![Oat Milk In A Glass Jug And Oat Spike On Light Background Vegan Non Dairy Alternative Milk Stock Photo - Download Image Now - iStock Oat Milk In A Glass Jug And Oat Spike On Light Background Vegan Non Dairy Alternative Milk Stock Photo - Download Image Now - iStock](https://media.istockphoto.com/id/1441907019/photo/oat-milk-in-a-glass-jug-and-oat-spike-on-light-background-vegan-non-dairy-alternative-milk.jpg?s=1024x1024&w=is&k=20&c=49EVDk3jconU1GTqVQcfeqa_IdYzw5_IdsACgLwew90=)
Oat Milk In A Glass Jug And Oat Spike On Light Background Vegan Non Dairy Alternative Milk Stock Photo - Download Image Now - iStock
![Jug with Milk, Spikelets and Rural Landscape Stock Vector - Illustration of spikelets, blue: 43447336 Jug with Milk, Spikelets and Rural Landscape Stock Vector - Illustration of spikelets, blue: 43447336](https://thumbs.dreamstime.com/z/jug-milk-spikelets-rural-landscape-vector-illustration-43447336.jpg)
Jug with Milk, Spikelets and Rural Landscape Stock Vector - Illustration of spikelets, blue: 43447336
![Amazon.com: Frothing Cup Coffee Spike Pitcher Jug Thickened Milk Jug Drawing Cup Stainless Steel Milk Foam Cup (350ML (with scale)): Home & Kitchen Amazon.com: Frothing Cup Coffee Spike Pitcher Jug Thickened Milk Jug Drawing Cup Stainless Steel Milk Foam Cup (350ML (with scale)): Home & Kitchen](https://m.media-amazon.com/images/I/51aUrC27CVL.jpg)
Amazon.com: Frothing Cup Coffee Spike Pitcher Jug Thickened Milk Jug Drawing Cup Stainless Steel Milk Foam Cup (350ML (with scale)): Home & Kitchen
![ELIANWARE 1.5/2.5/4Ltr Water Juice Jug Pitcher, Jug With Handle, Drinkware, Lids Jag Air Minuman, E-84/WH, E-85/WH, E-86/WH – EPLAS ELIANWARE 1.5/2.5/4Ltr Water Juice Jug Pitcher, Jug With Handle, Drinkware, Lids Jag Air Minuman, E-84/WH, E-85/WH, E-86/WH – EPLAS](https://www.ee-jia.com/v2/wp-content/uploads/E-84-85-86T-P2-01.jpg)
ELIANWARE 1.5/2.5/4Ltr Water Juice Jug Pitcher, Jug With Handle, Drinkware, Lids Jag Air Minuman, E-84/WH, E-85/WH, E-86/WH – EPLAS
![Amazon.com: Milk Jug for Whisk, Milk Jug with PTFE Coating for Cafe 400ml Spike (Green): Home & Kitchen Amazon.com: Milk Jug for Whisk, Milk Jug with PTFE Coating for Cafe 400ml Spike (Green): Home & Kitchen](https://m.media-amazon.com/images/I/71zXNzUq0eL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Milk Jug for Whisk, Milk Jug with PTFE Coating for Cafe 400ml Spike (Green): Home & Kitchen
![Galvanized Steel Milk Jug With Faux Lavender Spike on a Reclaimed Recycled Stained Wood Shelf - Etsy Galvanized Steel Milk Jug With Faux Lavender Spike on a Reclaimed Recycled Stained Wood Shelf - Etsy](https://i.etsystatic.com/35590258/r/il/2c4e63/4176257662/il_fullxfull.4176257662_got0.jpg)
Galvanized Steel Milk Jug With Faux Lavender Spike on a Reclaimed Recycled Stained Wood Shelf - Etsy
![Amazon.com: Milk Jug for Whisk, Milk Jug with PTFE Coating for Cafe 400ml Spike (Yellow): Home & Kitchen Amazon.com: Milk Jug for Whisk, Milk Jug with PTFE Coating for Cafe 400ml Spike (Yellow): Home & Kitchen](https://m.media-amazon.com/images/I/61YfQHPyQZL.jpg)
Amazon.com: Milk Jug for Whisk, Milk Jug with PTFE Coating for Cafe 400ml Spike (Yellow): Home & Kitchen
![Amazon.com: Milk Jug for Whisk, Milk Jug with PTFE Coating for Cafe 400ml Spike (Green): Home & Kitchen Amazon.com: Milk Jug for Whisk, Milk Jug with PTFE Coating for Cafe 400ml Spike (Green): Home & Kitchen](https://m.media-amazon.com/images/I/61vOwfK-GoL._AC_UF894,1000_QL80_.jpg)