Jan 2020

Teen invents dust-free chalk

Written by Silusapho Nyanda

A primary school science experiment has earned a young girl national recognition and may herald some good news both for teachers and the environment.

A Grade Seven pupil of HP Ngwenya Public Primary School in Chesterville, Durban, has chalked up a win for teachers.

The young teen has created a chalk that emits minimal dust and is environmentally friendly. HP Ngwenya Public Primary School pupil Maluta Gcabashe has invented a new chalk that emits less dust.

Maluta Gcabashe (13) hit upon the idea after noticing how her teachers were often covered in chalk dust. “Most teachers get their hands dirty when they write on the board. Chalk dust is also not healthy to breathe in,” said Gcabashe.

She set about researching chalk production, reading scientific articles and watching videos she found online. “I learned the techniques online with my mentor but then applied my own additions to the concept,” she said.

Gcabashe has already created two chalks using Maizena, popularly known as corn flour, and eggshells.

Her first chalk was Maizena-based and was moulded in a toilet paper inner that she had made narrower. The second used eggshells, Maizena and water. “I took the eggs’ inner membrane and then grounded it. I grounded it until it was a fine powder, before mixing it with Maizena,” she said.

Both mixtures were then left to set for 24 hours.

The invention got the nod from teachers at a neighbouring high school. “I took my chalk to teachers at Bonela Secondary School and asked them to try it out and they wrote recommendations saying they would use the chalk,” Gcabashe explained.

She was also recognised at the Eskom Expo International Science Fair, where she was awarded the Best Development Project prize.

“The chalk needs to be produced locally using recycled and natural material. I hope it will become accepted by teachers as an alternative to both standard chalk and the kind of chalk one can buy that is dustless,” said Gcabashe.

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