Re: Viscosity & Gum & Baume
Judy Seigel (jseigel@panix.com)
Wed, 12 Jun 1996 00:36:36 -0400 (EDT)
On Tue, 11 Jun 1996, TERRY KING wrote:
> Terry, you seem to be answering the wrong question about the
> Baume. Jeff is saying that the higher numbers are thinner solutions.
> You're saying that they're thicker. One of you is probably wrong.... I'll
> add, BTW, that my nice RBP gum is heavier, tho still labelled 14 baume, so
> go figure....
> As small changes in the viscosity of a gum can have significant effects on its
> performance, is there a measure of viscosity that might more appropriately used
> in our discussions ?
>
> The significance related to my own experience is that I find that 17 Baume gums,
> the W & N and Gloy and slightly heavier gums such as gum arabic powder mixed as
> a fifty percent solution, work well for me giving very little risk of
> degradation in the highlights even with unsized papers. I find that others use
> 14 Baume gums or dilute their 17 Baume gum with water but I understand that they
> are working with hardened substrates.
>
> This only tends to confirm that gum is a very forgiving medium.
Maybe so, but I'm getting to be a less forgiving medium by the minute....
Have you answered my question? No you haven't.
My Websters says there are two scales for specific gravity -- one for
liquids heavier than water, one for lighter -- but doesn't tell whether
the higher numbers are denser or waterier and neither have you.
My experience is that some gauges (as with metals) go one way, others go
the other way. ****The question arises because Jeff is using the numbers
as if higher is thinner. Terry is using them as if higher is thicker.****
Nothing under Baume in the Britannica. Or the World Book.
Hello?
Judy