Thank you for debunking the blooming alga theory, A Realist. I was going to check out the article for actual factual information myself but you already did that & quoted FROM the article itself what really caused the red color.
It never ceases to amaze me on this site & in real life the unbelief shown in not believing the Scriptures nor even reading the verse correctly nor showing the actual context!
So many want to attribute the supernatural signs & wonders of God to non-creative naturalistic explanations, denying the Creator who made them & not giving Him thanks for the amazing miracles of deliverance of the people of Israel out of bondage in the land of Egypt.
Here is the actual Scripture, IN CONTEXT, so one gets the full understanding of what is being said here.
Exodus 4:1-9 Then Moses answered, “What if they refuse to believe me or listen to my voice? For they may say, ‘The LORD has not appeared to you.’”
2And the LORD asked him, “What is that in your hand?” “A staff,” he replied. “Throw it on the ground,” said the Lord. So Moses threw it on the ground & it became a snake, & he ran from it.
4“Stretch out your hand & grab it by the tail,” the LORD said to Moses. So he reached out his hand & caught the snake & it turned back into a staff in his hand. “THIS IS SO, SO THAT THEY MAY BELIEVE that the LORD, the God of their fathers—the God of Abraham, the God of Isaac & the God of Jacob—has appeared to you.”
6Furthermore, the LORD said to Moses, “Put your hand inside your cloak. ” So he put his hand inside his cloak & when he took it out, his hand was leprous, white as snow. “Put your hand back inside your cloak,” said the LORD. So Moses put his hand back inside his cloak & when he took it out, it was restored, like the rest of his skin.
8And the LORD said, “If they REFUSE TO BELIEVE YOU or heed the witness of the 1st sign, they MAY believe that of the 2nd. But if they do not believe EVEN these two signs or listen to your voice, take some water from the Nile & pour it on the dry ground. Then the water you take FROM the Nile will become blood ON the GROUIND.”
If one does not believe the third sign or miracle from God, it becomes evident they didn't believe in the first two signs. No third sign would be needed if they had believed in the first one or two.
Did the staff actually turn into a snake? The normal language used to describe a snake & a staff shows them both to be literal & not figurative. The same is true for what happened to Moses' hand. Why would someone not believe the third to be just as literal as the first two?
Jesus & the apostles said because of the hardness of a person's heart & their dull ears, turning aside from the truth & believing a lie.
Did the water in the washing pots used for purification actually turn from water & into the best wine by this, the FIRST SIGN of Jesus? Of course!
John 2:11 Jesus performed this, the first of His signs, at Cana in Galilee. He thus REVEALED HIS GLORY & His disciples BELIEVED IN HIM.
The purpose of the three signs was to demonstrate the God of miracles & the God who promised that He would indeed deliver Israel out of bondage from Egypt & take them to the Promised Land--that Abraham, Isaac & Jacob communicated to Israel in the Abrahamic covenant.
The verses above verify this very thing, that God does what He says He will do. He says what He means & means what He says.
Also the text says that this THIRD sign FROM God was water TAKEN OUT OF the Nile River & poured onto the dry ground. Only the water poured out actually changed into & became blood on the ground, not the rive itself.
And lest we further divorce the whole context, isolating a few verses, here is what Moses, with Aaron did BEFORE the elders of Israel, in the same chapter.
Exodus 4:29-31 Then Moses & Aaron went & assembled all the elders of the Israelites & Aaron relayed everything that the LORD had said to Moses. And Moses PERFORMED THE SIGNS before the people & THEY BELIEVED. And when they heard that the LORD had attended to the Israelites & had SEEN THEIR AFFLICTION, THEY BOWED DOWN & WORSHIPED.
Moses showed these three signs to the elders, the leaders of the Israelites, BEFORE showing them to Pharaoh! And they believed them to be literal & real.