A bag of the substance washed ashore on a Dutch island.
With more containers expected to reach the West Frisian Islands in the coming days, three containers transporting toxic materials are still missing.
A load of unsafe chemicals that fell off one of the world's largest container ships into the North Sea washed up on a Dutch beach on Thursday, and more debris was expected to land overnight, officials said. German authorities say two of them contained risky substances: organic peroxide in one case and lithium-ion batteries in the other.
It is unclear how many containers sank to the bottom of the sea and how many are still floating.
So far, around 20 containers have been located near the shores of these islands while another six were found in German waters. The Dutch military sent troops Friday to help clear beaches.
The lost cargo also included toys, clothing items, light bulbs and flat screen TVs.
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A Dutch coastguard plane was due to undertake a new search on Thursday morning while strong winds were hampering the MSC Zoe's own attempts to carry out an inventory.
Jan-Willem Zwart, spokesman for the security services of the Frisian Islands said: "We strongly advise residents and people who have come to clean the beaches to immediately seek medical attention if they come into contact with the bags (containing organic peroxide)".
Friesland provincial authorities said the peroxide was safely removed from the beach.
"MSC takes this incident very seriously, both in terms of the impact of such accidents on the natural environment and in terms of any damage to customers' cargo", MSC said.
Volunteers collect the washed up content from containers onboard of the Panamian-flagged MSC Zoe vessel in Moddergat, on January 3, 2019.