Would dental floss devices that come with the floss work?
They are sold as disposable but may be too expensive for classes.
If used with india ink they would be less toxic.
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At 06:08 AM 12/3/97 -0800, you wrote:
>At 8:39 AM -0500 12/3/97, Kathleen Archer wrote:
>>Does anyone have a good method for marking positions on growing leaves?
You can then run cotton thread between the
>threads of the two screws to achieve proper spacing.
>Then you can paint the threads (or dip the apparatus)
>with India ink and then lightly touch the organ to
>be marked.
