Yesterday, for my brewing liquor build from distilled, I added all minerals to the heated full volume strike (I no sparge). I inadvertently added the pickling lime along with all other additions to include rehydrated Brewtan B. Right after I did it I had a ‘Duh’ moment knowing I’ve read in “Water Knowledge” by Martin that I should have added everything but the lime to the water and added the lime to the mash. Anyway, I pumped the hot strike into the MLT and noticed the residual had a brown tinge to it. It was more concentrated color than the rehydrated Brewtan B. I expected but did not see residual calcium in the bottom of the BK. What do you think the redial Brown tinged liquid was?
When brewing with lightly mineralized water, it doesn’t matter if you add the lime before or after the grain. There is nothing in the water to precipitate.
As to the reaction with the brewtan, I’m not sure what might have gone on there. I do know that brewtan reacts with iron and produces a dark tint.
Sometimes my water is brownish, sometimes it’s pinkish, usually it’s neither and has no color. It’s never made any difference to the beer.
Mine is often deep purple; Mark III era to be specific
Thanks all.
Brown water, pink water, purple water. DOES THIS BOTHER NO ONE?! 
I kid! I kid! Sort of…
Funny… I was thinking exactly the same thing.
I know!! I hate it how the grain makes my nice colorless water and turns it somewhere between yellow and black.
Purple is the color of nobility.
Brown is the color of… oh, uh, never mind. [emoji851]