Digital BW, The Print

I'm currently experimenting with HP's Vivera PK ink.  Not having a scale
to mix by weight, the most accurate way, I made an Excel spreadsheet. 
The spreadsheet calculates the ratios by volume to mix LK and LLK from
any ink.  It assumes LK is 70:30 (by weight) base to ink and LLK is 91:9
(by weight) base to ink.  LLK is mixed from LK, the most accurate way. 
The base used is Paul Roark's C6.  The ingredients needed to mix C6 are
also computed.  All computations are based on the final desired volumes
you want to end up with.

The above calculations are accurate because the specific gravity of the
ink is entered into the formulas.  From Paul Roark, the secific weight
of HP-PK compared to C6 base is 0.96.  If you want to mix another ink,
you will need it's specific weight.  This can be calculated by measuring
the weight of equal volumes of base and ink.  The relation of these
weights is the specific weight.  For example, if one liter of C6 weighs
1000 grams and 1 liter of the desired ink weighs 960 grams, the specific
weight is 0.96.  You can use grams, ounces (weight), liters, or ounces
(fluid) as long as you use the same units all the way through your
calculations.

If using this method, try to use the same measuring device as much as
possible so that any inaccuracies will be equally applied to all
measurements.  Also, use the measuring device at its maximum volume if
possible.  In otherwords, measure 10 cc with a 10 cc syringe, not a 100
cc syringe.  Syringes in the US are required by the FDA to be accurate
to only +/- 4% of full reading unless they are insulin syringes, in
which case the accuracy is +/- 2%.  If you use the same syringe near
full capacity for all fluids, you should end up with reasonably accurate
results since the same inaccuracies will be equally applied to all
fluids.

I'll be glad to post the spreadsheet to the forum if the moderators will
help me out.  I think they have to do it.

Bob