<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Verne_Frantz</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Kurt S</div><div class="ubbcode-body">How can you mess up the pH? Had some chemical/coating on a part?
I have a small container with the solution that I keep using. It's just getting browner. I'll have to look for the pH test kit and check it. </div></div>
I'd be interested in knowing that too because I've used it a lot and it turns brown, then black in no time for me. My parts are all degreased when I dunk them. It gets expensive! I've also noticed that if you leave a part in it too long, it will re-deposit a dark gary oxide back ONTO the part. IT washes right off with something like Spray-9 though.
Verne [img]<<GRAEMLIN_URL>>/flag.gif[/img] </div></div>
I've been using evapo-rust for several years and agree the solution after several uses eventually turns black. When new or lightly used it seems to leave no film (darkening) but once it starts to turn a darker color if parts are left in too long especially castings it has a tendency to darken the material. Cannot beat it for ease of working. Back several years ago I placed my driveshaft in a capped 5' length of 4" PVC plastic pipe and added 2 gallons which completed engulfed the driveshaft. After a day I could clearly see paint stripes and painted yokes not noticed prior.
