File talk:Phenolphthalein-in-conc-sulfuric-acid.jpg

Source specification

Benjah-bmm27 , or others: could you please provide a precise source?
-If you picked the file from the internet - please provide a specific URL.
-If you digitized it yourself, then please state so and therefore please specify the book you took as source, e.g. giving the ISBN number. If possible add pagenumber.
-If you made a diagram yourself - please provide your Template or data-source
-If there is a sourcecode used in generation, it is highly appreciated to provide it.
Thanks in advance. --Itu (留言) 15:50, 28 March 2024 (UTC)

Hi Itu, I took this photo myself. In those days, as far as I remember, we didn’t tend to include source information, templates, etc. It shows how much has changed. Ben (留言) 21:36, 28 March 2024 (UTC)