The Scarlet Thread:
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Behold, when we come into the land, thou shalt bind this line of scarlet thread in the window which thou didst let us down by: and thou shalt bring thy father, and thy mother, and thy brethren, and all thy father's household, home unto thee.
18
Joshua 2:18
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kokkinos Scarlet/ carminic acid/ Carmine /
coch·i·neal
A red dye made of the dried and pulverized bodies of female cochineal insects. It is used as a biological stain and as an indicator in acid-base titrations.
http://www.yourdictionary.com/ahd/c/c0442500.html
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bravenet.com