Bromine

This topic contains 3 replies, has 4 voices, and was last updated by  jgmotamedi 7 months ago.

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  • #17517

    Giovibleu
    Participant

    Hello,

    I’ ve been doing bdags for a couple years but only using iodine.
    I would like to begin to sensitize with bromine in order to do faster plates for a dag of the moon.
    I boght a blister of pure Brome but I don’t know how to dilute it..

    I heard that there are some people doing this with silica gel.
    Could anyone give me the recipe?

    Thanks in advance!
    Giovana

    #17519

    photolytic
    Participant

    Don’t used Bromine on Becquerel plates!

    That being said, please see the following post by Mike Robinson from May 11, 2013 at 7:03 am #15953

    Mike Robinson

    Participant

    Bromine in water according to the old manuals is 1 drop in 40 of water.

    lime (calcium hydroxide) should be a medium pink through and through. see picture “bromine in lime”

    I find silica gel 6/16 mesh the best medium for controlling bromine. I call it Robinson’s Quick.

    I discovered this in 2003 and have been using it ever since. Bromine in silica gel should be yellow.
    see picture stock/vs/working. When bromine works too slow, add a small amount of stock.

    the picture shows how the silica gel is charged.

    Mike Robinson

    Attachments:

    stockvsworking
    stockvsworking.jpg

    bromine-in-lime
    bromine-in-lime.jpg

    charging
    charging.jpg

    #17520

    phuphuphnik
    Participant

    I have been able to do lunar dags with Bequerel. I used an 8″ SC celesteron. it was a 7 minute exposure

    #17688

    jgmotamedi
    Participant

    Just wanted to add to Photolytic’s post:

    The ratio of 1:40 is most likely for a saturated solution of bromine-water (see this link) further diluted in water. In other words, you have to first create a saturated solution of bromine-water and then dilute this 1:40 with water. Diluting pure bromine 1:40 with water would be very strong.

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