Stress fractures from acid etch

[sc_bane]

Hello all. I use a couple of different acids to etch specific or random patterns on 1095 blades, and some 440hc. I usually do not allow the acid any contact with the spine, assuming that any removal of metal on the spine would create a potential stress fracture point. I usually end the pattern within 3/32" of the spine. Am I being to cautious, or is there no basis for this?
Pattern depths are usually a few thousandths deep.

Also, same question in regard to decorative filework on the spine.

 

[Stacy E. Apelt - Bladesmith]

The acid etch won't cause a stress fracture, but it will expose one that is already there.

 

[sc_bane]

Thank you again Bladsmth. Let me clarify a little. Will the eroded areas act as a stress riser when a user is abusing the crap out of an etched or fileworked blade?
Just fyi, due to the number of my posts you answer, I may start looking over my shoulder a little! Thanks for taking the time to answer my questions so often.

 

[Stacy E. Apelt - Bladesmith]

No, the shallow and smooth bottomed groove made by the etch will not start a crack due to a stress riser. A deep and sharply angled place, like triangular jimping, may be such a spot....but acid etching isn't worth one second of concern.

 

[sc_bane]

Thank you. Reason I asked...I have a coulple Ka-bar fighters, and the guy wants an etch on them, but he's known to use knives as a toolbox...hard use. Thanks again.