Pencils or not?

Having struggled these last few years with permanent markers* which were not permanent, for plastic labels I've now swapped over to wooden labels and a pencil but the pencil is too light and I can't read it. I need a dark writing pencil. So would that be a B or 2B?
* 2 years ago or so I bought a pack containing 6 coloured permanent markers from a well known make. The writing disappeared after 5 weeks in the greenhouse. I wrote to them to express my disappointment - they sent me a pack of 2 dozen - same make!!!!
What does everyone else use??
* 2 years ago or so I bought a pack containing 6 coloured permanent markers from a well known make. The writing disappeared after 5 weeks in the greenhouse. I wrote to them to express my disappointment - they sent me a pack of 2 dozen - same make!!!!
What does everyone else use??
'Optimism is the faith that leads to achievement' - Helen Keller
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I find the only reliable way to identify seedlings is to take a picture and put it on here.