I think it may have been me who mentioned the Imagineers' method of aging brass. I have scoured the Internet, but I have not been able to find any references to the recipe. My vague recollection is that in addition to cow poo it included straw, vinegar, and molasses. I could be wrong abnout the other ingredients- it's been many years since I got the tour of the "underside" of Epcot Center.
In ye olden times (and in 3rd world countries) tanning a hide to make leather used dung, urine, cow brains etc. and it sounds a bit like the process you have just followed. So perhaps modern tanning techniques would age the brass as well. I found this crowd (with an outlet in Hunstville).
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Are the design challenges the same as with embedded systems, but with a little developer- and IT-skills added in? What do engineers need to know? Rick Merritt talks with two experts about the tools and best options for designing IoT devices in 2016. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.