On Tue, 07 Jun 2005 19:24:47 +0200, Nick Müller wrote:

Artemia Salina wrote:

How do you use oil and chalk to find the end of a crack?

Pour some thin oil on the suspect place, let it penetrate, whipe it
carefuly off, and dust some powdered chalk over the place. The chalk
will suck the oil out of the crack and will get dark. voila!
Well, you can also buy expensive super space science spray for that ...

Ok, thanks. That almost sounds like my "dirty thumb" method of crack
detection: Clean suspect area well, then wipe with dirty thumb.