Dilution Question

(missblueamerican) wrote in message . com...
So, if I want to dilute Rodianl 1:50 in a 32 oz tank, would that mean
that I would want 4oz rodinal to 28 oz of water? would that be
correct?

thanks
K

No, and don't use ounce measures, use metric.

Start with 1 litre (1000cc) as your target.

Divide that by 51: 1000/51=19.60784313725490196078431372549

Or: 20 to make it easy.

Place 20cc of Rodinal in a graduate, then fill with water to 1000cc.

In article ,
(Michael Scarpitti) wrote:

(missblueamerican) wrote in message
. com...
So, if I want to dilute Rodianl 1:50 in a 32 oz tank, would that mean
that I would want 4oz rodinal to 28 oz of water? would that be
correct?

thanks
K

No, and don't use ounce measures, use metric.

Start with 1 litre (1000cc) as your target.

Divide that by 51: 1000/51=19.60784313725490196078431372549

Or: 20 to make it easy.

Place 20cc of Rodinal in a graduate, then fill with water to 1000cc.

1:50 would be 1020cc, not that it would make a lot of difference in this
particular dilution.

"d23" nospam@here wrote in message
...
No. 32 / 50 = .64 so the two- thirds oz mark on your graduate would
be
the closest.

This is one reason most use the metric system in the darkroom. Your tank
holds a little more than a liter, but if you measure with water you'll
almost certainly find that 1 liter will cover your film with room to
spare.
That makes it easy-- 1000 / 50 = 20 cc (you will need a metric
graduate).

Not that it really maters, but if the the aim is 32oz, with a dilution of
1:50 you would need an amount of rodinal equal to:

Rodinal = 32 / ( 50 + 1)

For 1000ml it would be:

Rodinal = 1000 / (50 + 1)

Guillermo

In article ,
(missblueamerican) wrote:

So, if I want to dilute Rodianl 1:50 in a 32 oz tank, would that mean
that I would want 4oz rodinal to 28 oz of water? would that be
correct?

No. But to make it real simple:
To 50 Oz water add 1 Oz Rodinal. Draw off 32 Oz and throw the rest away.

Or reserve the rest, or make a larger total (working solution) so you don't
throw away so much. The stuff keeps a really long time as a working solution
if sealed properly. If you use 4oz Rodi and 28 Oz water you have a working
solution with a ratio of 1:7..... Not what you want.
_________________
Ready, Fire, AIM.
Bruce
Brooklyn, N.Y.

Michael Scarpitti wrote:
(missblueamerican) wrote in message . com...

So, if I want to dilute Rodianl 1:50 in a 32 oz tank, would that mean
that I would want 4oz rodinal to 28 oz of water? would that be
correct?

thanks
K


No, and don't use ounce measures, use metric.

Start with 1 litre (1000cc) as your target.

Divide that by 51: 1000/51=19.60784313725490196078431372549

Or: 20 to make it easy.

Place 20cc of Rodinal in a graduate, then fill with water to 1000cc.

Or, so we don't have to measure down to the molecule, 20 cc Rodinal added to
1000 cc of water.

BertS wrote in message link.net...


Or, so we don't have to measure down to the molecule, 20 cc Rodinal added to
1000 cc of water.

No, that's wrong! 20cc of Rodinal + 980 cc of water = total 1000cc.

1000 / 51 = 19.60784313725490196078431372549

Round 19.60784313725490196078431372549 up to '20'. Add 20cc Rodinal to
the graduate, than add water to make up 1000cc.