I remember some years ago when I was being prepared for confirmation by my parish priest, who'd been the incumbent in that particular parish for 25 years. He decided to give all the confirmands a tour of the church, including the vestry. He explained what each part of the vestments symbolised, pointed out all the architecture etc. Inside the vestry, I saw a bottle of ink sitting on his desk. "What's that for?" I asked. He said it was special ink that he was supposed to use for all certificates and records of baptisms, burials and marriages. This special ink would mean that the record would last for a hundred years or more. But he said he couldn't be bothered to use it, so he always just used a biro.
No doubt you can all imagine my face turning various shades of puce to purple, before I went off like a firework!