Little ones coming and going? Some thoughts
I too am dad to a couple of young kids, now 4 and 7 - they were 1 and 4 when I first commissioned this (i think 7th or 9th depending on how you count them) darkroom. The rule in Dads darkroom is that they are welcome to come in when I am in there and they want to visit. They are not welcome when I am not there. In the early days I locked the door. Now they seem to not be interested unless I am in there doing something.
Do a google search on 'Mr. Yuck' the character created in the 60's befoe standard hazard labels were developed. I took a GIF of the Mr. Yuck icon, cloned them, and printed out a page of labels with this logo on them. I stick them on almost every bottle stored under the sink. My dry chemistry is stored on shelves above the sink, or in a cabinet beside the sink up high, which is presently out of their reach unless they were very determined.
Last weekend I was printing out some photos I took of my oldest son with his pals at school, for him to give out at the end of the school year (which for me happens today). They both were keen to see this happen, so I sat them on one end of the enlarger bench, and then would pick up a barely filled tray and hold it where they could see the image develop. My oldest one was giving the play by play to the younger one, and he described 'Now you put the paper in the water'. I let him dip his finger in the 'water' to taste, and he quickly agreed that even though it was clear it wasnt 'water'. We reviewed the Mr. Yuck concept, and how things are not always what they look like.