Re: Chalk Marks Question
We use railroad chalk and keel, the smaller oilier marking material someone asked about, in bridge inspection to make notes on the structure for reference and photos.toggle quoted messageShow quoted text
Keel is longer lasting and is sometimes still visible a year later.
Brian J. Carlson
On Nov 9, 2018, at 4:31 PM, Bob Chaparro <chiefbobbb@...> wrote: