![Amazon.com: HENXFEN LEAD Coffee Mugs Set of 4 - Ceramic Cups 10 Oz with Large Handle for Coffee, Soup, Tea, Milk, Latte and Cocoa, Mug Gift Set Microwave & Oven, Dishwasher Safe - Amazon.com: HENXFEN LEAD Coffee Mugs Set of 4 - Ceramic Cups 10 Oz with Large Handle for Coffee, Soup, Tea, Milk, Latte and Cocoa, Mug Gift Set Microwave & Oven, Dishwasher Safe -](https://m.media-amazon.com/images/I/61Uk8oweRSL._AC_UF894,1000_QL80_.jpg)
Amazon.com: HENXFEN LEAD Coffee Mugs Set of 4 - Ceramic Cups 10 Oz with Large Handle for Coffee, Soup, Tea, Milk, Latte and Cocoa, Mug Gift Set Microwave & Oven, Dishwasher Safe -
![I feel like this is a good one. I put this ceramic mug in the microwave sometimes and overtime this black sludge appears in the outside? What is it and why do I feel like this is a good one. I put this ceramic mug in the microwave sometimes and overtime this black sludge appears in the outside? What is it and why do](https://preview.redd.it/omkr9m7r1ld01.jpg?width=640&crop=smart&auto=webp&s=78cf0b4e014d28417e156ba1ef725fd743a98b87)
I feel like this is a good one. I put this ceramic mug in the microwave sometimes and overtime this black sludge appears in the outside? What is it and why do
![The Risks Of Heating A Stainless Steel Coffee Mug In The Microwave: Tips For Safe And Efficient Heating – TheCommonsCafe The Risks Of Heating A Stainless Steel Coffee Mug In The Microwave: Tips For Safe And Efficient Heating – TheCommonsCafe](https://cdn.thecommonscafe.com/can_stainless_steel_coffee_mug_go_in_microwave.jpg)