reel or magnetically coated plastic tape
When sugar is exposed to dry heat, it caramelizes and forms a brown, sweet, and nutty substance called caramel.
bituminous coal
The reddish brown flaky substance formed on iron is called rust. Rust is caused by the oxidation of iron in the presence of water and oxygen.
The brown substance that appears in the mouth of a patient with liver failure is a coffee ground substance.
The chemical change in which a substance combines with oxygen, such as the formation of iron rust, is called oxidation. This process occurs when iron reacts with oxygen in the presence of moisture to form iron oxide, which is the red-brown substance known as rust.
it is a hard brown substance is your pants
Iodine
solution
If it has a color there is substance & not just air.
It might be mud.
My daughter is 9 years old, she woke up this moring with a black/brown substance on her teeth and tongue with a vomit tast in her mouth. what can cause this?
the sticky brown substance in a cigarette is tar.