A potter prepares clay to make earthenware cups, known as "Bhar" by the locals, at a workshop in Kolkata, India, July 15, 2019. The "Bhar" is a type of low cost, eco-friendly earthenware cup commonly used to serve milk or tea in Kolkata. (Photo: Xinhua)

A potter prepares clay to make earthenware cups, known as "Bhar" by the locals, at a workshop in Kolkata, India, July 15, 2019. The "Bhar" is a type of low cost, eco-friendly earthenware cup commonly used to serve milk or tea in Kolkata. (Photo: Xinhua)

Customers enjoy tea from earthenware cups known as "Bhar" by the locals, at a roadside tea stall in Kolkata, India, July 15, 2019. The "Bhar" is a type of low cost, eco-friendly earthenware cup commonly used to serve milk or tea in Kolkata. (Photo: Xinhua)

A man pours tea into earthenware cups, known as "Bhar" by the locals, at a roadside tea stall in Kolkata, India, July 15, 2019. The "Bhar" is a type of low cost, eco-friendly earthenware cup commonly used to serve milk or tea in Kolkata. (Photo: Xinhua)

A potter prepares clay to make earthenware cups, known as "Bhar" by the locals, at a workshop in Kolkata, India, July 15, 2019. The "Bhar" is a type of low cost, eco-friendly earthenware cup commonly used to serve milk or tea in Kolkata. (Photo: Xinhua)

A potter makes earthenware cups, known as "Bhar" by the locals, at a workshop in Kolkata, India, July 15, 2019. The "Bhar" is a type of low cost, eco-friendly earthenware cup commonly used to serve milk or tea in Kolkata. (Photo: Xinhua)

Potters make earthenware cups, known as "Bhar" by the locals, at a workshop in Kolkata, India, July 15, 2019. The "Bhar" is a type of low cost, eco-friendly earthenware cup commonly used to serve milk or tea in Kolkata. (Photo: Xinhua)

A potter carries earthenware cups, known as "Bhar" by the locals, to dry them in the sun at a workshop in Kolkata, India, July 15, 2019. The "Bhar" is a type of low cost, eco-friendly earthenware cup commonly used to serve milk or tea in Kolkata. (Photo: Xinhua)

Partially dried earthenware cups, known as "Bhar" by the locals, are seen at a workshop in Kolkata, India, July 15, 2019. The "Bhar" is a type of low cost, eco-friendly earthenware cup commonly used to serve milk or tea in Kolkata. (Photo: Xinhua)

A potter makes earthenware cups, known as "Bhar" by the locals, at a workshop in Kolkata, India, July 15, 2019. The "Bhar" is a type of low cost, eco-friendly earthenware cup commonly used to serve milk or tea in Kolkata. (Photo: Xinhua)

A potter makes earthenware cups, known as "Bhar" by the locals, at a workshop in Kolkata, India, July 15, 2019. The "Bhar" is a type of low cost, eco-friendly earthenware cup commonly used to serve milk or tea in Kolkata. (Photo: Xinhua)

Potters make earthenware cups, known as "Bhar" by the locals, at a workshop in Kolkata, India, July 15, 2019. The "Bhar" is a type of low cost, eco-friendly earthenware cup commonly used to serve milk or tea in Kolkata. (Photo: Xinhua)