Platen colors are for Hardness. Here is the complete breakdown of typewriter platen colors, their hardness levels, and how they perform:## Typewriter Platen Color & Hardness Chart| Platen Color | Shore A Hardness | Typing Feel & Characteristics | Best Suited For... ||---|---|---|---|| Light Gray / Off-White | 85 – 87 (Soft) | Highly cushioned, muffled "thup" sound. Very quiet, but text imprint can look slightly less sharp. | Comfort typists, ultra-portable machines, and preventing paper piercing. || Teal / Muted Blue-Gray | 85 – 88 (Soft/Medium) | Iconic historic factory standard (e.g., Swiss Hermes 3000). Smooth, buttery feel with great acoustic dampening. | Vintage European portables and mid-century aesthetic restorations. || Bright Blue | 88 – 90 (Medium) | Modern custom synthetic rubber. Perfect "sweet spot" that yields a crisp print without loud impact noise. | Modern custom restorations, antique portables (like Corona 3 or Remington). || Standard Black | 88 – 92 (Medium/Firm) | Replicates the original factory specification for most classic manual typewriters. Excellent, crisp lettering. | Standard everyday manual typewriters (e.g., Smith-Corona, Underwood, Olympia). || Bright Orange / Red | 93 – 100+ (Hard) | Incredibly dense and solid strike backing. Controls heavy vibration but creates a very loud, sharp snap. | Electromechanical/electric typewriters (like the IBM Selectric) and heavy office machines. || DIY Heat-Shrink Blue/Black | 95 – 100+ (Rock Hard) | Often a cheap cosmetic cover-up over a dead platen. Feels like hard plastic, sounds deafening, and punches holes in paper. | Avoid for regular typing; requires a backing sheet if used. |

For platens 83-98 Shore A depending on the amount of copies being typed. From personal experience though 83A is super soft and the slugs sink into it a bit too much, the sweet spot is around 87-90 Shore A imo.

The platen was quite hard to begin with, around 100 on the Shore A hardness scale, though it would feed two sheets reliably. The platen was cleaned and treated with methyl salicylate, which brought the hardness down to about 92, and has remained at that hardness for several months.