[Histonet] HT practical exam blocks and slides

[bcfinlay <@t> cox.net]

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.