Patina of pitch “Winter”

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The patina of rosin and beeswax tends to be tough at room temperature, It is well known that the optimum temperature is around 20-25 degrees, At these temperatures, you get a good polishing and patina performs its function regularly.
In the winter months, If you do not have the possibility to work in an air-conditioned environment, the polishing operation becomes problematic and poorly efficient. Also making frequent adjustments mixture hardness patina-mirror with pre-heating and pressing, But even with these measures becomes difficult if not futile, try to Polish with temperatures below 16-17 degrees.
One solution is to increase the doses of “fabric softeners” used in the recipe of patina, to try to lower the melting point of rosin and then make the film more malleable.

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THE WINTER RECIPE

The recipe (*) It is suitable for ambient temperatures between 10 and 16 degrees in which the patina made with standard doses would be almost unusable.
The ingredients are the commonly used, These amounts refer to 100 g Rosin, liquid measurement related to the CAP for 1 Kg.

Component

Quantity

%

Colophone

100 g

53

Beeswax

90 g

47

Boiled linseed oil

3 caps (12 ml )

Turpentine

2 caps (8 ml )

FEATURES AND USAGE

  • among the 12 and 14 degrees the patina from the best, adaptation without pre-heating succeeds with a good long press, the smoothness and friction are okay and while working the cerium oxide develops in significant amounts the friendly white foam, that usually indicates a good efficacy of past. Polishing is done on schedule, I have not noticed differences from the polishing in air-conditioned environment and standard with patina.
    The machined surface is smooth, free of roughness without reaching the quality and accuracy of machining with patinas for higher temperatures, but remaining slightly below that level.
  • At temperatures above 17-18 degrees the patina becomes too soft, the nail sinks without difficulty in the compound and the pressure at a point with a finger, can disfigure.
  • Under the 10 degrees the patina is still partially its function, its efficiency is however minimized, adaptation without a minimum pre-heating is difficult, and attempts to form on the mirror figure fixes with application of localized pressure lead to the formation of roughness and streaks.

Based on this little experience , can be summarized in this table empirical, the results on the efficiency of winter patina in ambient temperature:

Patina di pece invernale

TIPS FOR PREPARING

If you decide to make a film with this recipe you should keep in mind some aspects:

  • the softness of the mixture requires us to leave it to cool and harden into its place without taking off prematurely the side railings.
  • Once the surface is almost at room temperature ( the Interior of the patina will be even a little’ warmer ) You may proceed with the adaptation with mirror, If it proves difficult you can soak for a few minutes in a basin with warm water, not more than 30°.
  • the channels are made strictly” When cold”, better with a cutter which with this mixture penetrates without difficulty, in fact an aluminium profile or even a knife , with the still warm patina, If pressed sinks literally in it by deforming the surface.
(*) The recipe presented is only the result of experience and personal experimentation, does not apply general technique, but just wants to provide guidance on a possible way forward to those being face these difficulties is looking for a solution.

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