Greg Guarino wrote:

I've got Titebond Original. The chalk temperature (anyone know the
derivation of the term?) is listed as "approximately 50".

From Franklin:

"When glue dries, the loss of water pulls the adhesive particles together
with enough force to form a continuous film. If the drying temperature is
below a critical point, water evaporation is not sufficient to pull the
particles together, leaving them in the joint. The dried film in the joint
will appear whiter than normal. This is known as "chalking" and the
critical temperature is the "chalk temperature." When chalking occurs, the
glued joint loses strength and could result in a failed bond."

*Chalk temperature indicates the lowest recommended temperature at which
the glue, air and materials can be during application, to assure a good
bond.

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