Alloy
yes
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deep red and yellow
There are a lot. For example, I know Purple and Green make it and I think Red and Green.
Red with some black or dark purple added to it.
Deep Red, Black, White.
alloy and iron
over heat it
a friend of mine had some deep heat sprayed across her neck and chest and it caused a severe red rash and neck ache so be aware there are side effects effecting some people
The deep red color in minerals is often due to the presence of iron oxide, such as hematite or garnet. Other minerals that can contribute to a deep red color include cinnabar (mercury sulfide) and rhodochrosite (manganese carbonate).
"Crimson" is a deep red colour.