Negative Technique

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    • 17th mayo 2021 a las 9:55 am #21192
      rene
      Participante

      Hello,

      for the negative technique I use a powder given me by a friend in China. I dissolve this powder in hot water.

      Does anybody nows which chemical is this powder?

      René

      rene@rene-boell.de

    • 20th agosto 2021 a las 7:46 pm #21292
      Tetsu Uma
      Participante

      Is it possibly peach sap or alum?

    • 20th agosto 2021 a las 10:11 pm #21296
      Rene
      Participante

      Yes, I think alum is correct, I will try the peach sap.

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