Friday, June 25, 2010

I think these are fairly good for 90 seconds

Despite obvious defects, here is super concentrated Reagent 3, which is rather like the formula as 55, but with the substitution of HC-110 for the developer, and with ammonia as the buffer and not sodium hydroxide or lithium hydroxide. No water added.

A total of only about 2 ounces, just poured in, and the Efke 25 negatives were exposed to light 90 seconds after pouring in the concentrate.  The top image is a DTR attempt using an absorbent sponge. Where the concentrate did penetrate, development was nearly complete, which means only a thin film of reagent like this is needed. Well, we knew that, right?

The bottom image is a partially submerged concentrate with no sponge, used as a control. The slope of the Paterson is responsible for the gradient from left to right, and the white areas on both are the consequence of exposing the negatives to room light then watching, and timing, the change to black with the remaining reagent. Time to black was about 30 seconds.

This is a very rapid reagent, and useful for our system. Click on the images to see details. Note the dendritic shapes around the sponge, which are a consequence of wetting action, as well as the mottled action, also characteristic of a kitchen sponge.  Also note there are some good spots.

I see no gross solarization on the can, even though after 90 seconds there was reagent on it in bright room light.  For that reason, I conclude that we have met the 2 minute requirement with room to spare, even with minimal amounts of reagent.  You cannot see what I am reporting without clicking on the images, and I can see how few anonymous visitors actually do click on the images, so please be one of them.

This is vacation time for many and I will leave you to the beach, or the mountains, for a couple of weeks while I focus on Soundwave Research and AMBIT Corp.

Back soon - enjoy Summer, and the long golden hours.

This is the 121st post on this blog. They sure do add up.

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