I just love to laugh when things go sideways. Acid Staining sideways is not the same sideways as painting.
Just as I thought I had a handle on things, I find out NOPE, more to learn.
Like in the case when one attempts to touch up staining and realizes too late “hey, that wasn’t the color I used”. That was the case with my driveway (aka testing grounds). Once we realized we added the wrong brown and it was completely noticeable, I started reaching out to friends in the industry how to un-do this. Part of the challenge is, unlike paint that sits on a surface, acid stain penetrates into the surface. YIKES. So do I grind? If I do there will be a polished look to the surface that makes it really hard to uniform the canvas (yes I like my art terms). So do I grind the whole driveway.
BTW: acid staining concrete is a skill that needs practice. Colors will change from concrete to concrete. Always good to check with manufactures and professionals before attempting these projects.
Lucky for me, I was handed me a bottle of yellow gel stuff that saved the project with no guarantee, just a lot of hope. Thank you Tek Gel! Please use this link to see steps: https://www.concretedecor.net/decorativeconcretearticles/vol-3-no-5-october-november-2003/tek-gel-for-profiling-from-surface-gel-tek/
It basically removed the dark stain by eating the concrete. It was a time saving creative solution that worked.
I now can finish staining and remember to pay attention to the colors I am grabbing.
Color is better and someday I will complete the project and share.