CAROLINE Shearer started the anti-weapons charity Only Cowards Carry after her son, Jay Whiston, was stabbed to death at a party in Colchester in 2012, aged just 17.
Edward Redman, now 18, of Stanway, is currently serving a 17-year jail term for the murder.
Ms Shearer says the charity will be writing to all Chelmsford schools to see if they want them to give a workshop to their students, following the latest incidents.
"For us Chelmsford is definitely our next focus," she said.
" The talks we give are for all children, we even go into primary schools to raise awareness and help keep our children safe.
"Children who have concerns come to us when we go into schools – some of the scariest things we've found was an eight-year-old with a knife, as well as others with machetes, knives that have been made to look like a mobile phone, or credit cards with blades in them.
"Some of the images the trainers show children graphically show the results of knife crime, in a bid to shock youngsters into staying away from carrying weapons.
"One demonstration shows that it only takes an inch of a knife to kill someone.
"It's only parents who have been through it who can understand how to get through it," added Caroline.
"A lot of the problems come from drugs and alcohol, but also peer-pressure. Education is the best way to stop the cycle and change their mind-set.
"The most dangerous schools are ones that think they don't have a problem. We've found public schools also have bad knife problems."
Clive Knowles, managing director at British Ironwork Centre, based in Oswestry, Shropshire, plans to make a 200ft angel out of blades handed into police, and Caroline is trying to get a feather of that sculpture constructed from knives taken off the streets of Essex.
