I'm not aware of any commercially-available slides with biological samples that have more than 3 fluorescent labels on them (Here at Molecular Probes / Thermo Fisher Scientific we offer the FluoCells slides, but those only have 3 dyes on them, on cells or tissue).
Another option would be our TetraSpeck bead slide, catalog T14792, which has microspheres of various sizes, each bead having four different dyes in them. It isn't biological, but it will work for color registration and alignment in 4 colors.
Jason A. Kilgore
Technical Application Scientist
Molecular Probes / EVOS Tech Support
Life Sciences Solutions
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Here we are working from home - freezer in lab being defrosted - cells frozen down, and still trying to collaborate to send some samples for microscope/system testing to another lab. Does anyone have suggestions for pre-prepped / pre-mounted fluorescence slides that have more than 3 labels - if there are such slides out there for purchase? Right now we are just looking for some type of test slide that we can send around to a couple different labs and get images from, but if possible we are looking for one with more than 3 labels to test some of the spectral capabilities of systems at these labs. Thanks!