Tag Archives: XRF

Mini Post No. 9 – Sometimes we get things wrong!

*NOTE – So the lovely people in the media department at the V&A have asked me to blog for them. This is a great opportunity for my work to reach a much larger audience! So I will be posting to the V&A blog 1st and then a little later I will post here. If you wish to keep up to date then check out my newest post over on the V&A Blog 🙂

Let me begin with a little confession – while we like to think of ourselves as immune to them, sometimes we make silly mistakes.

This happened most recently when we began the XRF analysis of some Julia Margaret Cameron photographs to see if the images had been tinted with other elements like gold. Many of you will know that before Instagram and selfies photographs were made with silver salts on paper. So when one is looking for the elements present within a photograph we expect to find silver.

The Darwin image under the XRF machine head. (c) Victoria and Albert Museum, London.

The Darwin image under the XRF machine head. (c) Victoria and Albert Museum, London.

Julia Margaret Cameron took a fantastic photo of Charles Darwin, so we started the analysis with that image only to find the ‘photograph’ contained zero silver. Cue panic from the conservation science team! The analysis was run a second, then a third time (what was the quote about doing the same thing over and over expecting a different result…). We then switched to an image we knew contained silver to see if it was there was something up with the XRF machine – nope, we could clearly see silver on that image. Cue even more panic from the team as thoughts of having to tell people our beloved Darwin image wasn’t what it was supposed to be…

Remember when your teacher would tell you to always read all of the exam question before beginning, turns out you should do that with object lists too… Our Darwin image isn’t a photograph based on silver salts. It is a carbon print and we never spotted this in the internal object description or the object description on ‘Search the Collections’ when we began the analysis. If we had we would never have picked that image to analyse because carbon is too light an element for our XRF to pick up.

Darwin

The ‘Search the Collections’ listing for the Darwin image we were working on – See that it clearly states that the image is a carbon print – If i could put a face-palm emoticon here I would…

Mini Post No.1

We calibrated the XRF machine this week – how often do you get your hands on these weird metals… 

Elements used for calibration of XRF

(c) Victoria and Albert Museum, London.

(Every now and then I will do a mini post between the regular, larger posts; normally these posts will be just a photo or a very short piece of writing – they will show more of the day-to-day work during my internship)