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RossCyanide. Another answer:The only one that comes easily to mind would be silver nitrate (or silvadine), which is used as a burn medication, but can be toxic if ingested. Cyanide has no such effect.
Umberto Eco refers to various pigments that were toxic in the middle-ages and that turn the tongue black in his book, The Name of the Rose.
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What element famous poison turns your tongue black?
The element thallium is a poisonous metal that can cause a person's tongue to turn black or discolored when ingested in toxic amounts. Thallium poisoning can lead to serious health effects, including damage to the nervous system and other organs.
What goes in boiling water to turn black?
Tea leaves go in boiling water to turn black.
Will chlorine turn sterling silver black?
Yes, chlorine can cause sterling silver to tarnish and turn black. It is best to avoid wearing sterling silver jewelry in chlorinated water to prevent this.
Why didn't the margins of the leaf turn blue black after the use of the iodine solution?
The margins of the leaf did not turn blue-black because there was no starch present in that area. The iodine solution reacts with starch to produce a blue-black color. If the margins did not turn blue-black, it suggests that there was no starch in that part of the leaf.
What colors could you mix with green to turn black?
To turn green into black, you would have to mix it with a dark shade of red, such as maroon or burgundy, in order to neutralize the green color. Mixing these complementary colors will create a darker shade that will eventually turn black.
