Do some organisms like insects have blood of other colours other than red? if yes, why?

Question

i just killed some insect and it has blood that looks like either dark red or black. so im wondering, are there organisms that have say blue or green blood? if yes then why? is it due to the haemoglobin in the blood or something?

Answer 1

Different organisms' blood can differ in color due to different chemical composition.  Also, human blood is not always red--it can be blue when traveling back to the heart to replenish oxygen.  It becomes red immediately when in contact with air due to its high oxygen content.  It follows that other organisms' blood also has this effect.

Answer 2

Insects have no red blood, because it is not compound the iron. The Insect`s blood main component is copper ( for blue blood) or magnesium ( for green blood).  

Answer 3

Insects have neither red blood cells or a circulatory system, so you aren't seeing the insect's blood. There other creatures however that do have blood that is not iron based like human blood (hemoglobin), which would give it a different color. One that comes to mind is the horseshoe crab, which have a blue, copper-based blood called lysate.