![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
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Amazon.com: Milk Jug for Whisk, Milk Jug with PTFE Coating for Cafe 400ml Spike (Yellow): Home & Kitchen
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304 Stainless Steel Pulling Cup Double-Sided Scale Thickened Spike Milk Tea Cup Chemical Wax Cup Pulling Playing Milk Froth Cup - AliExpress
![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)
Amazon.com: Milk Jug for Whisk, Milk Jug with PTFE Coating for Cafe 400ml Spike (Green): Home & Kitchen
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![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
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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 (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)