Is there ACID BURN on this Pa. bluestone?

by Cindy
(Seattle, WA)

/Users/evans/Pictures/iPhoto Library/Modified/2010/Apr 25, 2010/IMG_7695_2.JPG
A PHOTO should be here! If not, I'll try sending photo again.

A month ago I sent question here about efflorescence on new mortar set flagstone. We then called Prosoco but they couldn't help.

(The contractor did mortar set on old 20x20' 1960's cement patio. Done in the rain and not cleaned at all until totally finished.

Then the contractor used muriatic acid 3 times at full strength. Contractor then tried 600 Detergent and later small amount of Ef-fortless. Still has drips, blobs, splashes, boot prints, and milky look. Some pieces seem darker, lots look bleached out.

--DID the REPEATED ACID TREATMENTS "burn" the Pa. bluestone?
--WHAT DOES BURNED STONE LOOK LIKE?
--What are long term implications if burned?
-- WHAT DO YOU RECOMMEND TO IMPROVE surface? Maybe sealer?

(The blue tape shows a different problem. The acid washed out the mortar between stones so it is now sandy, deep grooves, holes, and water collects in spaces.)

We appreciate you help. We bought your video--after the problem happened.

Thanks,
Cindy