Eight-year-old Shana Richardson died after licking a commonly-sold white powder from her hand.
The ant killer she had used on insects near her home in St Leonards contained a chemical called lindane.
A pathologist concluded the small amount of this substance she ingested was linked to her death.
This tragedy adds force to a national campaign to ban the use of lindane, which has also been linked to birth defects and breast cancer.
Under a EU regulation, it will be withdrawn from sale in shops from June this year.
But anyone who has stocks of this potentially-deadly chemical should dispose of them well before then.
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