For my HT practical, I used a Secureline marker on the slides and then I hand wrote labels out with a regular pen.  We also use pencils for our blocks, but I decided to use the Secureline marker on my blocks as well.  

I processed my tissue first and then embedded the tissues in different blocks labeled with the marker.  The marker won't work on our cassettes through processing and that's the reason I did it this way.


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